Wikipedia:WikiProject U.S. Roads/Maryland/All-time list

Given are the years of the first and last official maps the routes appear on. These are not always the exact years the routes were created or eliminated.

Routes 1-6 and 12-37 were assigned by 1927. It appears that other state roads received numbers (into the 380s?) in about 1929, but only a few of them appear on maps until 1939. A year before 1939 means that the road was state maintained beginning on that year's map (for now I've only gone back to 1928).

The 1939 map may have some routes that were actually created several years later; 683 appears to be the highest number actually existing in 1939. Those that are not on the 1940 map are listed with an asterisk.

Most routes for which the sole source is http://www.mdroads.com/ are listed after the table.

from to notes
MD 2 1927 now
MD 3 1927 now
MD 4 1927 now
MD 5 1927 now
MD 6 1927 now
MD 7 1938?
← US 40 (part)
now
MD 8 1960
← 33 (part)
now
MD 9 1965 1978
→ 956
proposed for US 140
MD 9 1978
← US 140 (part)
when proposed for Reisterstown-Westminster
MD 10 1974 now
MD 12 1927 now
MD 14 1927 now
MD 16 1927 now
MD 17 1940
← 33
now
MD 17 1927 1939
→ 33
MD 18 1927 now
MD 19 1927 now
MD 20 1927 now
MD 21 1927 now
MD 22 1927 now
MD 23 1927 now
MD 24 1927 now looks like a piece of Trimble Road or Nuttal Avenue in Edgewood was a state road (e.g. 1961 map) - what was it numbered?
MD 25 1927 now
MD 26 1927 now
MD 27 1934
← 29
now
MD 27 1927 1933
→ US 29
MD 28 1927 now
MD 29 1927 1933
→ 27
MD 30 1927 now
MD 31 1927 now
MD 32 1927 now
MD 33 1940
← 17
now
MD 33 1927 1939
→ 17
MD 34 1927 now
MD 35 1927 now
MD 36 1927 now
MD 37 1963? 1997 map style changes at the same time, so it may predate 1963; one source says it may be as early as 1935
MD 37 1927 1934
→ US 219 (part)
MD 38 1928 now
MD 39 1928 now
MD 41 1965 now
MD 41 1928 1955
→ 135 (part)
MD 42 1928 now
MD 43 1965 now where was 43 originally? Probably bridge to Blaine (now part of 38)
MD 44 1936 1968 Fort Frederick State Park
where was 44 originally? Probably bridge to Bloomington (became part of 135)
MD 45 1957
← US 111 (part)
now
MD 45 1928 1955 Frostburg-west
unlabeled on state maps but listed on http://www.mdroads.com/routes/040-059.html#md045 and on https://catalog.archives.gov/id/12549393
MD 46 1950 1989
→ I-195
where was 46 originally? Probably northeast of Cumberland-Cumberland (became part of US 220)
MD 47 1928 now
MD 48 1928 1955 Hazen Road, northeast of Cumberland
unlabeled after 1949
MD 49 1928 now
MD 51 1928 now labeled in 1933
MD 52 1928 1955 Williams Road, Cumberland
MD 53 1928 now
MD 54 1969
← 455, 467
now
MD 54 1933 1949? Myersville-northwest
where was 54 originally? probably Cumberland to West Virginia (became part of US 220)
MD 55 1928 now
MD 56 1928 now
MD 57 1928 now
MD 58 1928 now
MD 59 1930 1955 Middletown-southeast
MD 59 1928 1928
→ 68 (part)
Probably Williamsport-southeast
MD 60 1928 now labeled in 1933
MD 61 2001 (HLR) now
MD 61 1928 1955 east of Hagerstown
MD 62 1928 now
MD 63 1928 now
MD 64 1928 now
MD 65 1928 now
MD 66 1928 now
MD 67 1928 now
MD 68 1928 now
MD 69 1928 1955 Braddock Heights-south
MD 70 1954 now
MD 70 1928 1949
→ 464 (part)
now 478
MD 71 1956 1958
→ US 301 (part)
MD 71 1928 1955
→ 194
labeled in 1933
MD 72 1928 1955 Lewistown-northeast
MD 73 1928 1968 Frederick-northwest
MD 74 1928 1955 Frederick-north
MD 75 1928 now labeled in 1933
MD 76 1928 now
MD 77 1928 now
MD 78 1928 1969
→ 180 (part)
now 351
MD 79 1928 now
MD 80 1928 now
MD 81 1928 1975
→ 550 (part)
labeled in 1933
was everything at the west end always 81?
MD 82 1930 1995 Leland Street/Maple Avenue, Bethesda
MD 82 1928 1928
→ 75 (part)
Probably east from Union Bridge
MD 83 1928? 1956 Church Street, New Windsor the original one?
possibly originally 71 northeast of Taneytown
MD 84 1928 now
MD 85 1970
← US 15 (part)
now
MD 85 1928 1953 Middleburg-east
MD 86 1928 now
MD 87 1928 1955 Mexico-southeast
MD 88 1928 now
MD 89 1928 1955 Hampstead-east
MD 90 1972 now
MD 90 1928 1955 Hampstead-southwest
MD 91 1928 now
MD 92 1934 1955 Smithsburg-northeast
MD 92 1928 1928
→ 91 (part)
Probably Gamber-northeast
MD 93 1928 1955 east of Eldersburg
MD 94 1928 now
MD 95 1930 1999 (HLR) Comus Road, Comus-west
MD 95 1928 1928
→ 94 (part)
Probably north from US 40
MD 96 1928 1955 Daisy-north
MD 97 1928 now labeled in 1933
MD 98 1928 1955 Glenelg-east
MD 99 1928 now
MD 100 1971
← 177 (part)
now
MD 100 1928 1955
→ 99 (part)
north of Ellicott City
MD 101 1928 1955 northeast of West Friendship
MD 102 1928 1949? Maryland Avenue, Ellicott City
MD 103 1928 now
MD 104 1977
← 175 (part)
now first labeled in 1979
MD 104 1928 1949? southeast of Ellicott City
MD 105 1928 1949? Ellicott City-north
MD 106 1928 1940
→ 32 (part)
MD 107 1928 now labeled in 1934
MD 108 1928 now labeled in 1933
MD 109 1928 now
MD 110 1948 1948 northwest of Mt. Airy
MD 110 1928 1928 Probably near Laytonsville-South
MD 112 1928 now
MD 114 1930 1973 Gaithersburg-north
unlabeled after 1957
MD 115 1928 now labeled in 1933
MD 116 1928 1959
→ 650 (part)
MD 117 1928 now
MD 118 1928 now
MD 119 1999 (HLR) now
MD 119 1928 1952
→ 121 (part)
Dawsonville-south, Dawsonville-Old Germantown
Dawsonville-Old Germantown became 121 in 1951-1952; north segment of this returns in 1955-1956 as 119, but has no number after 1957
MD 120 1930 1999 (HLR) Germantown-north
MD 121 1928 now
MD 122 1991 now
MD 122 1928 1973 Damascus-northwest
MD 123 1928 1973 Damascus-Lewisdale
MD 124 1928 now labeled in 1933
MD 125 1928 now
MD 126 1928 1997 Gwynn Oak Avenue, Baltimore-Woodlawn (still in 2005 Baltimore City HLR)
MD 127 1928 1985 north of Reisterstown
may have swapped with 128 at some point
MD 128 1930 now
MD 129 1928 now
MD 130 1928 now
MD 131 1928 now
MD 132 1969
← 22 (part)
now
MD 132 1930 1954 northwest of Lutherville
MD 133 1928 now
MD 134 1928 now
MD 135 1930 now probably not the original 135 (doesn't fit the clustering)
MD 136 1928 now doesn't quite fit the clustering; did they intend to make this 163?
MD 137 1928 now
MD 138 1928 now
MD 139 1928 now labeled in 1933
MD 140 1979
← US 140 (part), 97 (part)
now
MD 141 1928 1960 Allegheny Avenue, Towson
unlabeled until 1946
MD 142 1928 1979 Weisburg-Shawsville
MD 143 1928 1981 Cockeysville-Jacksonville
MD 144 1952
← US 40A (part)
now
MD 144 1928 1939
→ 146 (part)
Towson-north
MD 145 1928 now
MD 146 1928 now
MD 147 1928 now labeled in 1933
MD 148 1928 1962 Joppa Road, Towson-Perry Hall
MD 149 1928 1965 White Marsh-Chase
also planned for the Windlass Freeway
MD 150 1928 now
MD 151 1928 now labeled in 1933
MD 152 1928 now
MD 153 1956
← 17 (part)
1983
→ 17 (part)
Cavetown-Myersville
MD 153 1928 1938?
→ 24 (part)
Bel Air-Van Bibber
not labeled on maps (except the unedited 1939 map) but listed on http://www.mdroads.com/routes/140-159.html#md153
MD 154 1928 1954 east of Fountain Green
MD 155 1928 now
MD 156 1928? now swapped with 155 in 1951-1952
MD 157 1991 now
MD 157 1928 1955 Havre de Grace-west
MD 158 1991 now
MD 158 1928 1955 southwest of Aberdeen
MD 159 1928 now
MD 160 1930 1954 Darlington-east
MD 161 1928 now
MD 162 1987 now had been part of 167
MD 162 1928??
← US 1 (part)
1955 north of Darlington; dam completed in 1928, causing US 1 to be rerouted
MD 163 1933 1954 northeast of Jarrettsville
intended original route typoed as 136?
MD 164 1933 1985? Charlestown-southwest
unlabeled after 1958
original route probably ran north from 165 and became part of 24
MD 164 1928 1930
→ 24 (part)
Probably north from 165
MD 165 1928 now labeled in 1933
MD 166 1928 now
MD 167 1928 1973 Hammonds Ferry Road, Linthicum
disappeared in 1961-1962 (had been only north of 170); reappeared in 1969 (only south of 170; this part is now 162)
MD 168 1930 now
MD 169 1928 now
MD 170 1928 now
MD 171 1928 now
MD 172 1928 now unlabeled
MD 173 1928 now
MD 174 1928 now
MD 175 1928 now
MD 176 1930 now
MD 177 1928 now
MD 178 1928 now labeled in 1935
MD 179 1928 now
MD 180 1965
← US 340 (part)
now
MD 180 1930 1940
→ 175 (part)
MD 181 1928 now Bay Ridge Avenue, Annapolis; disappeared in 1983-1985 but returned on only the Spa Creek bridge in 2009 (HLR)
MD 182 1928 now
MD 183 1928 1979 Randolph Road, Wheaton-Colesville
MD 184 1928 1999 (HLR) Blair Road, Takoma Park
completely missing from 1939 map
MD 185 1964 now unlabeled until 1965
MD 185 never? never? Juniper Street, Takoma Park (not from the 1930s, since Juniper Street isn't shown as a state road on 1930s maps)
MD 185 1928 when?
→ 97 (part)
Probably south from north of Olney
MD 186 1928 now
MD 187 1928 now
MD 188 1928 now
MD 189 1928 now
MD 190 1928 now
MD 191 1928 now did this continue southeast to Western Avenue (e.g. 1939 map)?
MD 192 1928 now
MD 193 1928 now
MD 194 1956
← 71
now
MD 194 1928 1955
→ 787
Sligo Creek Parkway (NOT Flower Avenue south of Piney Branch Road), Silver Spring
MD 195 1930 now
MD 196 1930 1999 (HLR) Old Columbia Pike
MD 197 1928 now was Jericho Park Road ever anything other than 197C?
197 crossed the railroad where 564 now does until 1989-1991, but the new bridge was a state road since its construction in 1981-1983
MD 198 1928 now
MD 199 1928 1953 east of Lanham
now 953
MD 200 2005 (HLR) now
MD 200 1928 1954 Larchmont Avenue, Capitol Heights-southwest
1939 map also shows Boones Hill Road; was this a state road?
MD 201 1928 now
MD 202 1928 now
MD 203 1928 1954 College Avenue, College Park
1928-1930 maps also show a loop west of US 1 in this area
MD 204 1928 1954 Poplar Avenue/Ray Road, Takoma Park
MD 205 1989 1995
→ 5 (part)
east of Waldorf
MD 205 1928 1955
→ 201 (part)
MD 206 2014 now
MD 206 1928 1969?
→ 208 (part)
Rhode Island Avenue/38th Street, Hyattsville
MD 207 1928 1968 Pennwood Road/Cottage Terrace, Hyattsville
unlabeled on maps, but listed on http://www.mdroads.com/routes/200-219.html#md207
MD 208 1928 now Hyattsville
MD 209 1928 1940
→ 410 (part)
Ager Road/Hamilton Street, Hyattsville
MD 210 1949 now
MD 210 1928 1940
→ 500 (part)
Hyattsville
MD 211 1928 1995 Sargent Road, Chillum
MD 212 1928 now
MD 213 1972
← US 213, 280
now
MD 214 1928 now labeled in 1938
what was old 214 on Pike Ridge Road southwest of Parole?
MD 215 1928 1955 Elkridge-west
MD 216 1928 now
MD 217 1928 1955 east of Jonestown
MD 218 1928 now
MD 219 when? now spur from US 219
existed by 1978
MD 221 1928 now Ritchie-Marlboro Road; disappeared in 1954-1955, but returned at the I-495 interchange in 2003 (HLR)
MD 222 1995
← US 222 (part)
now
MD 223 1928 now
MD 224 1928 now labeled in 1933
MD 225 1928 now
MD 226 1928 1955
→ 227 (part)
MD 227 1928 now
MD 228 1928 now
MD 229 1995
← 228 (part)
now
MD 229 1928 1955 Wayside-Morgantown
MD 230 1928 1955 Newburg-Mount Victoria
MD 231 1928 now
MD 232 1928 1987 Budds Creek-east of Beantown
MD 233 1928 1955
→ 382 (part)
Waldorf-Aquasco
MD 234 1928 now labeled in 1935
MD 235 1928 now
MD 236 1930 now
MD 237 1987 now
MD 237 1928 1960
→ 234 (part)
MD 238 1928 now
MD 239 1928 now
MD 241 1928 1955 Avenue-Abell
MD 242 1928 now
MD 243 1928 now
MD 244 1928 now
MD 245 1928 now
MD 246 1928 now
MD 247 1946 now
MD 247 1928 1930?
→ 235 (part)
never labeled; probably assigned to the bit of 235 east of 246
MD 248 1928 1943 northeast of Jarboesville
MD 249 1928 now what was old 249 in Tall Timbers (e.g. 1961 map)?
MD 250 1950 now formerly US 13
MD 250 1928 1940
→ 244 (part)
Valley Lee-northwest
MD 251 1940 1977 58th Avenue, Berwyn Heights
MD 251 1928 1940
→ 244 (part)
Valley Lee-Drayden
MD 252 1928 1981 Ridge-Wynne
MD 253 1928 now
MD 254 1958
← 533
now
MD 254 1928 1933?
→ 214 (part)
Davidsonville-east; never labeled; listed in 1931-34 report
MD 255 1928 now
MD 256 1928 now
MD 257 1957 ← 3 (part) now
MD 257 1928 1939
→ 256 (part)
not labeled on maps (except the unedited 1939 map); http://www.mdroads.com/routes/240-259.html#md257 says it was west from Deale and that makes sense in the clustering
MD 258 1928 now
MD 259 1928 now
MD 260 1928 now labeled in 1933
MD 261 1930 now
MD 262 1928 now
MD 263 1928 now
MD 264 1928 now
MD 265 1930 now
MD 266 1928 1956 Lusby-southwest
MD 267 1928 now
MD 268 when? now existed by 1978
MD 268 1928 1936
→ US 222 (part)
Perryville-Conowingo; never labeled; listed in 1931-34 report
MD 269 1928 1983 Port Deposit-Rising Sun
MD 270 1933 now not the original 270 (doesn't fit the clustering)
what was added in 1930 to the west of 270?
MD 270 1928 when?
→276 (part)
Port Deposit
MD 271 1930? 1946? Perryville
MD 272 1928 now
MD 273 1928 now labeled in 1933
MD 274 1928 now
MD 275 1966 now
MD 275 1930 never? old US 213 (?) south of Chestertown, 1930 (per bridge)
MD 275 1928 1928
→ 269 (part)
East from Colora
MD 276 1928 now
MD 277 1928 now
MD 278 1928 1940
→ 896
MD 279 1928 now
MD 280 1928 1971
→ 213 (part)
MD 281 1933 now missing in 1939
not the original 281?
MD 282 1928 now
MD 283 1928 1958
→ 282 (part)
simply an extension of 282 until the rest of 282 was added by 1930
MD 284 1928? now
MD 285 1930 now
MD 286 1930 now
MD 287 1933 now probably not the original 287 (doesn't quite fit the clustering)
MD 288 1928 now
MD 289 1928 now
MD 290 1928 now
MD 291 1930 now
MD 292 1928 now
MD 293 1930? 1949? Betterton
MD 294 1930? 1946? Betterton
MD 295 1977 now
MD 295 1930? 1946? Betterton
MD 296 1930? 1946? Betterton
MD 297 1928 now
MD 298 1930 now
MD 299 1930 now
MD 300 1928 now labeled in 1933
MD 301 1928 1939
→ 290 (part)
south of 544
MD 302 1928 now
MD 303 1960
← 309 (part)
now
MD 303 1928 1954
→ 309 (part)
MD 304 1928 now
MD 305 1928 now
MD 306 1928 now
MD 307 1928 now
MD 308 1928? now unlabeled
MD 309 1928 now
MD 310 1928 now doesn't quite fit the clustering
MD 311 1928 now
MD 312 1928 now
MD 313 1927 now
MD 314 1928 now
MD 315 1964
← 318 (part)
now
MD 315 1956 1956
→ 68 (part)
Clearspring-Williamsport; not on maps
MD 315 1928 1949
→ 314 (part)
MD 316 1928 now may not be the original 316 (doesn't fit the clustering); Bush to Graceton Road, Harford County (shown on a 1937 map) according to http://www.mdroads.com/routes/mdroutes.txt was probably 136
MD 317 1928 now
MD 318 1928 now
MD 319 1928 1955
→ 318 (part)
MD 320 1928 now probably not the original 320 (doesn't fit the clustering)
MD 321 1928? 1955 Main Street, Elkridge
doesn't fit the clustering
MD 322 1966 now
MD 322 1952 1953
→ 313 (part)
Andersontown-south
MD 322 1928? 1946 321 to 1
unlabeled on maps
doesn't fit the clustering
MD 323 1928? 1946 321 to 1
unlabeled on maps
doesn't fit the clustering
MD 324 1928 now
MD 325 1930 1977 Catonsville-south
doesn't fit the clustering
MD 326 1933 when? Leonardtown
still existed in 1985
doesn't fit the clustering
MD 327 when? now bridge is from 1942 (rebuilt 1968)
MD 327 1930 1955 northwest of La Plata
doesn't fit the clustering
MD 328 1928 now
MD 329 1928 now why is this state aid on some 1930s maps?
MD 330 1989 now
MD 330 1928? 1985 Kingsville
probably not the original 330 (doesn't fit the clustering)
MD 331 1939
← US 213 (part)
now
MD 331 1928 1938
→ US 213 (part)
Easton-Cambridge; never labeled; listed in 1931-34 report
MD 332 1969
← 214 (part)
now
MD 332 1928 1958 Easton
MD 333 1928 now
MD 334 1928 now
MD 335 1928 now
MD 336 1928 now
MD 337 1928 now doesn't fit the clustering
MD 338 1928 1979 east of Conowingo
doesn't fit the clustering
MD 339 1978? 1999 Sligo Avenue, Silver Spring; formerly part of 320
not labeled on maps but listed on http://www.mdroads.com/routes/320-339.html#md339
MD 339 1928? 1953? old US 213 (later 331) south of Hurlock
MD 341 1966
← 16 (part)
now
MD 341 1928? 1958 old 14 (?) west of Brookview
unlabeled on maps
MD 341 1928 1930
→ US 213 (part)
Probably Vienna-Rhodesdale
MD 342 1939*
← 310 (part)
now
MD 342 1928 1938
→ 14 (part)
16 to 14 west of Secretary
MD 343 1928 now
MD 344 1957
← 6 (part)
now had been part of 224 until 1955-1956
MD 344 1928 1938
→ US 213 (part)
Vienna-Cambridge; labeled in 1935 (probably initially continued east to Mardela Springs)
MD 345 1946 1956 southeast of Redhouse
MD 345 1928 1930
→ 16 (part)
Probably west from Cumberland
MD 346 1928 now originally only in Salisbury (see 1950 inset); temporarily disappeared after 1953
MD 347 1928 now
MD 348 1930 now
MD 349 1928 now
MD 350 1928 now
MD 351 1989
← 180 (part)
2014
MD 351 1928 1955 Fruitland-southeast
MD 352 1928 now
MD 353 1928 now
MD 354 1928 now
MD 355 1955
← US 240A
now
MD 355 1928 1953 loop in Crisfield
MD 356 1928 1960 Kingston-east
MD 357 1928 1989 Marion-northwest, Marion-southeast
MD 358 1928? now originally only southeast of Crisfield
MD 359 1974?
← US 113 (part)
now
MD 359 1928? 1949? southeast of Crisfield
MD 360 1928? 1953 southeast of Crisfield
MD 361 1928 now
MD 362 1930 now
MD 363 1928 now
MD 364 1928 now
MD 365 1928 now
MD 366 1928 now
MD 367 1928 now
MD 368 1928 now
MD 369 1928 1955 Newark-east
MD 370 1933 now doesn't fit the clustering
MD 370 1928 1930
→ 354 (part)
Probably north from Snow Hill
MD 371 1928 now
MD 372 1928 now doesn't fit the clustering
MD 373 1955 now where was 373 originally?
MD 374 1930 now
MD 375 1928? now may have originally followed West Street to Evans Road
MD 376 1928 now
MD 377 1928?? now existed by 1937, but this may have been part of US 213 in 1928-1930
MD 378 1928? now
MD 379 1939 1949? Leonardtown
was there an earlier 379?
MD 380 1930? now
MD 381 1928 now doesn't fit the clustering
MD 382 1928 now doesn't fit the clustering
MD 383 1930 now
MD 384 1930 now
MD 385 1949 1963
→ 352 (part)
northwest of Whitehaven
MD 385 1928 1940 northeast of Federalsburg
doesn't fit the clustering
MD 386 1930 1972 Severna Park-west
MD 387 1930 now
MD 388 1930 now
MD 389 1930 1954 Addison Road, Seat Pleasant-southeast
MD 390 1930 now Started out as Columbia Boulevard; extended south in 1960 over 653
not on 1940s county map
MD 391 1930 1999 (HLR) Seminary Road/Dale Drive, Silver Spring
MD 392 1930 now
MD 393 1954
← 2 (part)
now
MD 393 1930 1948
→ 255 (part)
Galesville-west
MD 394 1975?
← US 113 (part)
1995
→ US 113B
Snow Hill
MD 394 1940 1956 Gortner-east
MD 394 1930 1939
→302 (part)
302 through Templeville
MD 395 1930
← US 220 (part)???
1981
→ US 220 (part)
Naves Cross Road, northeast of Cumberland
last labeled in 1953, but still shown as a state road afterwards
MD 396 1933 now
MD 397 1930 1972 Cambridge-Airey
MD 398 1930 1956
→ 63 (part)
MD 399 1933 1973 Damascus-east
MD 400 1930 1989 south of Owings Mills
MD 401 1933 1985 Butler-northeast
MD 402 1933 now
MD 403 1950?? 1955?
→ 410 (part)
Riverdale
MD 403 1930? 1950? Level Village Road, Aldino?
unlabeled on maps, but listed on http://www.mdroads.com/routes/400-419.html#md403
MD 404 1930 now labeled in 1933
MD 405 1930 now
MD 406 1930? 1960
→ 667 (part)
shown southeast from Harold in 1930
MD 407 1933 now
MD 408 1965
← 4 (part)
now
MD 408 1930 1951
→ 24 (part)
Van Bibber-Edgewood
MD 409 1930 1989 Maryland Line-Freeland
MD 410 1930 now labeled in 1933
MD 411 1930 1940
→ US 1 (part)
Rhode Island Avenue
labeled in 1933
MD 412 1930 1989 Queensbury Road/Riverdale Road, Hyattsville
MD 413 1927 now
MD 414 1930 now
MD 415 1930 1955 Scotland-east
MD 416 1930 1964
→ 4 (part)
labeled in 1933
MD 417 1930 1962
→ 669
labeled in 1935
MD 418 1930 now
MD 419 1930 1958 Dickerson-northeast, Dickerson-southwest
MD 420 1930 1973 Brink Road/Sundown Road, Goshen-Laytonsville
MD 421 1930 1958 Travilah Road, west of Rockville
MD 422 1930 now
MD 423 1930 now
MD 424 1930 now
MD 425 1930 now
MD 426 1933 1955 Nanjemoy-west
MD 427 1933 1987 west of Bel Alton
MD 428 1933 1955 Dentsville-south
MD 429 1930 1955 Faulkner-south
MD 430 1933? now not sure if 430, 434, or both were added in 1933
MD 431 2019 now
MD 431 1933 1955 Drayden-south
MD 432 1971??
← 32 (part)
now
MD 432 1930 1958 south of Damascus
MD 433 2019 now
MD 433 1951 1957 Federalsburg-Smithville
MD 433 1933 1940
→ 212 (part)
Beltsville
part of 212 in 1939*
MD 434 1933? 1989 Berwyn Road/Pontiac Street, Greenbelt
unlabeled until 1946
MD 435 1930 now
MD 436 1930 now
MD 437 1930 1974 Annapolis
weird swapping with 435-436-438 in 1953-1954?
only on maps beginning in 1956
MD 438 1930 1974 Annapolis
weird swapping with 435-436-437 in 1953-1954
MD 439 1933 now
MD 440 1933 now
MD 441 1938 1958 Providence-east
unlabeled until 1946
was there an earlier 441?
MD 442 1933 1987 south of Betterton
did this include the south end of Rosedale Cannery Road (seems to be old 566, bypassed 1960-1961)?
MD 443 1933 1987 south of Betterton
MD 444 1933 now
MD 445 1930 now
MD 446 1930 now
MD 447 when?
← 444 (part)
1987 Locust Grove
bypassed in 1956 and shown as a state road in 1961, but the older 447 still existed then
MD 447 1930 1962
→ 291 (part)
MD 448 1930 1987 Kennedyville-south, Kennedyville-north
MD 449 1956?? 1987?? now
MD 449 1934? 1958 Perryville
did this also include current 222 south of US 40?
MD 450 1954
← US 50 (part)
now
MD 450 1933 1938?
→ 16 (part)
southeast of Denton; never labeled (except on unedited 1939 map) but listed on http://www.mdroads.com/routes/440-459.html#md450
MD 451 1933 1997 swapped with 33 in 1956-1957
MD 452 1930 now
MD 453 1933 1955 Woodmont Road, west of Hancock
MD 454 1933 now
MD 455 1939 1968
→ 54 (part)
was there an earlier 455?
MD 456 1933 now
MD 457 1951 1957 Greensboro-Burrsville
MD 457 1933 1946
→ 328 (part)
MD 458 1933 now
MD 459 1933 now
MD 460 1933?? now
MD 461 1933 1950 old US 1 southwest of Bel Air, 1930 (per bridge)
MD 462 1933 now
MD 463 1933 1998 old US 111 at Parkton, 1930 (per bridge)
MD 464 1933 now
MD 465 1933 1968 Crownsville-east
MD 466 1972
← 166 (part)
1977 what's the Halethorpe-west (Clarke Boulevard/Cedar Avenue?) that appears in 1933? if this wasn't 466, where was it originally?
MD 467 1939* 1968
→ 54 (part)
was there an earlier 467?
MD 468 1933 now
MD 469 1933 1955 Port Tobacco-south
MD 470 1933 now
MD 471 1933 now
MD 472 1933 now
MD 473 1933 1958 Fairview-south
MD 474 1933? 1936? 1957 Denton-Hobbs
MD 475 2001 (HLR) 2009 (HLR) East Street, Frederick
MD 475 1950?
← US 13 (part)
1953
→ 663 (part)
Division Street, Salisbury
MD 475 1933? 1940
→ 358 (part)
northeast of Crisfield
MD 476 1933 1955 east of Lisbon
MD 477 1931
← US 1 (part)
1983 Elkridge-southwest
was Montgomery Road northwest to US 1 a state road?
MD 478 1968?
← 464 (part)
now
MD 478 1931 1956 Old US 40, Washington County
MD 479 1935 1999 (HLR) east of Cambridge
MD 480 1933 now
MD 481 1933 now
MD 482 1933 now
MD 483 1931 (per bridge)
← 174 (part)
1940? Severn
MD 484 1933 1987 Marbury-Port Tobacco
MD 485 1949
← 404 (part)
now Section on Double Hills Road, Denton removed 1957
MD 485 1933 1947
→ 750 (part)
Middle Street, Vienna
MD 486 1949
← 404 (part)
1957 Old 313 west of Goldsboro, Caroline County
not on maps
MD 486 1933 1947
→ 331 (part)
spur from MD 331 to US 50, Vienna
MD 487 1933 when?
→ 750 (part)
Race Street, Vienna
MD 488 1933 now
MD 489 1956 now
MD 489 1934? 1949? Whiteleysburg-southeast
MD 490 1933 now
MD 491 1957 now
MD 491 1933 1955
→ 425 (part)
MD 492 1933 1953 Maryland Park Drive, Maryland Park
MD 493 1933 1975 portion renumbered 700; kept on Orems Road from 700 (Service Road) to 599 (Old Orems Road)
MD 494 1933 now
MD 495 1933 now
MD 496 1933 now
MD 497 1933 now
MD 498 1933 1981 Piney Point-southwest
MD 499 1933 1955 south of Chaptico
MD 500 1933 now
MD 501 1933 now
MD 502 1946 1959 southeast of Stockton
original 502 was probably northwest from Great Mills (became part of 471 by 1939)
MD 503 1933 1956 Appeal-Olivet
now partly 760
MD 504 1933 1956 Appeal-Dowell
MD 505 1933 1956 Appeal-west
MD 506 1933 now
MD 507 1933 1956 Stoakley-west
MD 508 1933 now
MD 509 1933 now
MD 510 1933 1956 west of Sunderland
MD 511 1933 1956 Island Creek-south
MD 512 1933 1956 Island Creek-west
MD 513 1987 now
MD 513 1933 1954
→ 320 (part)
Piney Branch Road, Takoma Park
shown as part of 320 in 1946, but back to 513 in 1948
MD 514 1951 now
MD 514 1933 1939 Park Valley Road, Silver Spring (shown in 1933)
MD 515 1933 1959 Silver Spring
MD 516 1933 1999 (HLR) Franklin Avenue, Silver Spring
MD 517 1933 1955
→ 136 (part)
MD 518 1933 now Shows on a 1937 map
MD 519 1933 1978 Glyndon-east
MD 520 1933 now
MD 521 1933 now
MD 523 1933 1956 Chaneyville-west
MD 524 1969
← 2 (part)
now unlabeled
MD 524 1933 1956 southwest of Owings
MD 525 1933 1956 Dunkirk-west
MD 526 2014 now
MD 526 1954??
← US 140 (part)
when? still existed in 1985
MD 526 1933 when?
→ 545 (part)
280 to 545, Elkton
MD 527 1933 when? old US 1, Elkridge
MD 528 1939 now existed by 1937, but it blends in with 378 on state maps
MD 529 1933
← US 13 (part)
now
MD 530 1939* when? Chestertown
probably existed earlier
MD 531 1946 1958 east of Eldorado
MD 531 1933 1940
→ 175 (part)
Waterloo-Jonestown
now mostly 108
MD 532 1933 1955 Mount Airy-east
MD 533 1933 1957
→ 254
Cobb Island-north
MD 534 1933
← 221 (part)?
1954 Forestville-northeast
MD 535 2001 (HLR) now connects I-495 and 5
MD 535 1933 1958 old 14, Brookview, 1931 (per bridge)
MD 536 1933 1955 southwest of Port Tobacco
MD 537 1948 (per bridge)
← 213 (part)
now
MD 537 1933? 1940
→ 135 (part), 495 (part)
MD 539 1956 1959
→ 108 (part)
Columbia-Jonestown
where was 539 originally?
MD 540 1933 Chestnut Avenue (old 513?), Takoma Park
MD 541 1933 1955 Tyaskin-south
MD 542 1933 now
MD 543 1933 now
MD 544 1933 now
MD 545 1933 now
MD 546 1933 now
MD 547 1933 now
MD 548 1933 1955 Allen-northwest
MD 549 1933 1954 Silesia-south
MD 550 1933 now
MD 551 1928?? 1955
→ 343 (part)
Washington Street, Cambridge
MD 552 1933 now
MD 553 1933??
← 2 (part)
now what was old 2 just north of 423? (e.g. 1961 map)
MD 554 1933 1981
→ 174 (part)
Reece Road, Severn
swapped with 170 in 1940-1946
MD 555 1933 1956 Plum Point-south
MD 556 1933 1983
→ 193 (part)
MD 557 1933 when? Brookes Ave, Gaithersburg
MD 558 1933 1955 Bel Alton-Newtown
MD 559 1933 1955 Westminster-east
MD 560 1933 now
MD 561 1933 now
MD 562 1933 now
MD 563 1933 1955
→ 224 (part)
MD 564 1934 now
MD 565 1939*
← 331 (part)
now unlabeled until 1946
MD 566 1949 now Probably originally Trappe-Barber (bypassed by 1935)
MD 567 1935 1997 Cromwell Bridge Road, east of Towson
MD 568 1935 now swapped with 367/368
MD 569 1935 1955 north of Westminster
MD 570 1935 1953
→ 97 (part)?
may have disappeared at first; not labeled as 97 until 1956
MD 571 1935 1955 northwest of Emmitsburg
unlabeled after 1949
MD 572 1935 1955 Gapland-northeast
MD 573 1935 1953 Eldersburg-northwest
MD 574 1934 1981 southeast of Hollywood
MD 575 2000 (HLR)
← US 113 (part)
now
MD 575 1934 1956 north of Huntingtown
MD 576 1935 1959 south of Pocomoke City
MD 577 1934 now
MD 578 1935 now
MD 579 1934 now
MD 580 1946 1953 north of Pocomoke City; old 364?
probably existed earlier
MD 581 1935 1953 Keymar-northwest
MD 582 1935 1973 east of Laytonsville
MD 583 1935 1955 southeast of Florence
MD 584 1939
← 5 (part)?
now probably existed earlier
MD 585 1935 1955 southeast of Salisbury
MD 586 1935 now
MD 587 1934 now
MD 588 1934 now
MD 589 1935 now
MD 590 1935
← US 1 (part)
1955 new bridge built 1934
unlabeled after 1953
MD 591 1933 (per bridge)
← US 1 (part)
now only on this map
MD 592 1935?
← US 1 (part)
1958 east of Rising Sun
MD 593 1939 1958 Brunett Avenue, Silver Spring
probably existed earlier
MD 594 2016 now includes part of the former one
MD 594 1939 1958 Wayne Avenue, Silver Spring
probably existed earlier
MD 595 1939 1958 Bonifant Street, Silver Spring
probably existed earlier
MD 596 1939 1958 Maple Avenue, Silver Spring
probably existed earlier
MD 597 1939 1940
→ 192 (part)
Forest Glen Road, Silver Spring
probably existed earlier
MD 597 when? 1955 Bonnie View Road; loop south off US 1 cut off on west side, NW of Harwood Park
MD 598 1934
← US 13 (part)
1960 Westover-Princess Anne
MD 599 1946?
← 493 (part)
1975 Middle River
not on maps, but shown on http://www.mdroads.com/routes/580-599.html#md599
MD 600 1946
← 150 (part)
1975 only three sections of Eastern Avenue remained in 1956
MD 601 1946? 1975 Middle River
not on maps, but shown on http://www.mdroads.com/routes/600-619.html#md601
MD 602 1946
← 216 (part)
1962
→ 198 (part)
MD 603 when? 1955 old US 40, Jug Bridge
not on maps
MD 603 1935 1939 Sundale Drive?? north from 410 west of 390
MD 604 1935 1955 south of Damascus
MD 605 1935 2005 Takoma Avenue, Takoma Park
MD 606 1935 1950
→ 304 (part)
MD 607 1936 now
MD 608 1935 1953 Sykesville-east
MD 609 1935 1979
→ 28 (part)
Norbeck-east
MD 610 1935 now
MD 611 1935 now
MD 612 1935 1953 Taneytown-north
MD 613 1936 1960?
→ 261 (part)
MD 614 1935 now
MD 615 1936 now
MD 616 1938 1955 Broadfording Road, south of Cearfoss
MD 617 when?
← 16 (part)
now
MD 617 1936 1957 American Corner-south
missing in 1939 but on 1937 county map; blank shield in 1940
MD 618 1936 1955 west of Keymar
MD 619 when?
← 313-404 (part)
now no Denton inset until 1978, at which time it existed (and is labeled)
MD 619 1938 1953 Union Bridge-southeast
MD 620 1938 1955 Taneytown-south
MD 621 1936 1989 American Corner-west
unlabeled in 1939; blank shield in 1940
MD 622 1938 1956 southwest of Westminster
MD 623 1938 now
MD 624 1938 now
MD 625 2006 (HLR)
← 5 (part)
now signed as 5B
MD 625 1939 1955 Sabillasville-north
MD 626 1939 1949? west of Ocean City
MD 627 1938 now
MD 628 1938 1955 Rice Road/Resley Road, west of Hancock
MD 629 1938 1955 Exline Road, west of Hancock
MD 630 1954
← 313 (part)
1990 Bureau-Federalsburg
MD 630 1939 1950
→ 84 (part)
Uniontown-northeast
MD 631 1950 (per bridge)
← 5 (part)
now
MD 631 1938 1949 Carmichael Road, south from Queenstown (not on maps)
MD 632 1938 now
MD 633 1950 (per bridges) 1955 old 26, Unionville
not on maps
MD 633 1938 1949? 16 east via Auction Road
MD 634 1938 1951
→ 543 (part)
MD 635 1938 1955 east of Aberdeen
MD 636 1938 now
MD 637 1939 now swapped with 5 in 1949-1950
MD 638 1938 now
MD 639 1970 now
MD 639 1950 1956 Kearney-northwest
did this exist earlier?
MD 640 1991 now
MD 640 1938 1955 Urbana-south
MD 641 1938 1955 west of Union Bridge
MD 642 1947 (per bridge)
← 173 (part)
now was there an earlier 642?
MD 644 1947? now removed for a while but returned in 2012 (HLR)
MD 645 when?
← 176 (part)
now new bridge is from 1936, a little early for the number 645
MD 646 1938 now swapped with 543 in 1940-1946
MD 647 1939?? 1949? southeast of Savage
MD 648 1939
← 2 (part)
now
MD 650 1935 now
MD 651 1939 1953 northeast of Jarrettsville
MD 652 1948?
← 170 (part)
now not shown until expanded 1950 inset
MD 652 1939 1940 Piney Grove-north
MD 653 1935 1959?
→ 390 (part)
16th Street, Silver Spring
MD 654 1939? 1956 Welsh Hill Road, Frostburg
MD 655 1983?
← 28 (part)
now
MD 655 1939 1956 Midland-west
disappears from maps after 1953
MD 656 when? now former US 50, bypassed 1951 (per bridge), but was it then part of 456?
MD 656 1939? 1956 Bridge Street, Lonaconing
MD 657 1939 2011 (HLR) Lonaconing-west
MD 658 1939 now appears on this county map, but not on state maps until 1972
MD 659 1939 1958 Silver Spring
MD 660 when? now
MD 661 1939 1993 Pomona-Quaker Neck Landing
MD 662 1948
← US 213 (part)
now
MD 662 1939 1940
→ 448 (part)
Kennedyville-north
MD 663 1939 1955 Salisbury-south
MD 664 1946 1993 south of Chestertown
was there an earlier 664?
MD 665 1950 now http://www.mdroads.com/routes/mdroutes.txt says original 665 was current US 40 west of Baltimore
MD 666 1939
← 193 (part)
1957
MD 667 1939
← 413 (part)
now
MD 668 1936 (per bridge)
← 30 (part)
now original segment is on this map
there may have been a period when no 668 existed
MD 669 1963
← 417
now
MD 669 1939 1955 north of Boonsboro
typoed? as a spur of 66 in 1939-1940
MD 670 1939 now unlabeled in 1940
MD 671 1939 1959 Girdletree-Bayview
MD 672 when? now
MD 673 1949 now unlabeled at first
was there an earlier 673?
MD 674 1946 now originally west from 445; later extended east on former 20
was there an earlier 674?
MD 675 1959
← US 13 (part)
now part at Delmar may have been US 13A at first, in which case the Princess Anne portion (1959) may be the original
MD 675 1939 1956 Old Liberty Road, east of Eldersburg
MD 676 1939 when? old 28, Rockville
MD 677 1938 (per bridge)
← 180 (part)
2003 (HLR) Odenton
MD 678 1939 1955 southwest of Finksburg
MD 680 1939 1956 north of Woodbine
MD 681 1939 1956 northwest of Westminster
MD 682 1939 1956 west of Lineboro
unlabeled until 1946
MD 683 1939 1956 Westminster-southeast
MD 684 1956 1983 Broad Branch Road, Chevy Chase
did this exist earlier? or was there another 684?
MD 685 1953 ← US 213 (part) 1979 old 213, Hack Point
did this exist earlier? or was there another 685?
MD 686 1946 1983 2nd Street, Brooklyn Park (still in 2005 Baltimore City HLR)
MD 687 1946 1956 south of Taylorsville
MD 688 1939* 1956 east of Gaithersburg
MD 689 1939* 1955 old 34, west of Sharpsburg
MD 690 1939* 1955 old US 40, east of Hancock
MD 690 1957
← US 1 (part)
1958 east of Rising Sun
only labeled in 1958
MD 691 1939* 1948
→ US 40 Alternate
now swapped with US 40
MD 692 1939* 1956 36 to 731, Allegany County
MD 693 1950
← 5 (part)
1955 south of Beantown, east of Bryantown
MD 694 1937? (per bridge) now
MD 695 1973 now
MD 695 1940 1954 Addison Road, Cheverly
MD 696 1946 1953 east of Princess Anne
MD 697 1946 1953 north of Westover
MD 697 1969
←274 (part)
1979 old 274, Bay View
unlabeled on maps
MD 698 1940 1985 Mill Street, Chestertown
MD 699 1941
←272 (part)
1979 old 272, Cecil County
unlabeled on maps
MD 700 1946
←493 (part)
now
MD 701 1956? now
MD 701 1939* 1951
→ 420 (part)
Laytonsville-east
MD 702 1973 now
MD 702 1946 1957 Bethesda
MD 703 when?
← 366 (part)
now
MD 703 1946 1954 southeast of Bowie
MD 704 1946 now
MD 705 1939* 1954 Croom-east
MD 706 1946 1970
→ 648 (part)
southeast of Glen Burnie at 100
MD 707 1946?
← US 213 (part)
now unlabeled until 1948
MD 709 1939* 1955 Green Ridge Road, west of Piney Grove
MD 710 1946 now
MD 711 1972?
← 710 (part)
now
MD 711 1939* 1958 north of Elkton
MD 712 1946 now
MD 713 1946
← 175 (part)
now
MD 714 1946
← 4 (part)
1981 southeast of Forestville
MD 715 1946
← 21 (part)?
now
MD 717 1962? now unlabeled
MD 718 1946
← 151 (part)
1997 Sparrows Point
MD 722 1946
← 235 (part)
1955 west of Turner, through Hollywood
MD 723 1942 (per bridge)
← 175 (part)
now
MD 725 1962
← 4 (part)
now unlabeled at first
was there an earlier 725?
MD 726 1959 (per bridge) now
MD 727 1949
← 268 (part)
now
MD 731 1990 (per bridge)
← US 50 (part)
now
MD 732 1987
← 32 (part)
now
MD 733 when? now new bridge is from 1932, a bit early for the number
MD 735 when? now
MD 736 1998 (TVM) now
MD 739 2015 now
MD 740 2015 now
MD 741 when?
← US 40A (part)
now
MD 742 1975
← 42 (part)
now
MD 743 when?
← US 40 (part)
now
MD 744 1950? 1955 Dorchester Avenue, Cambridge
MD 746 1992?? (per bridge)
← 25 (part)
now
MD 750 when?
← US 50 (part)
now
MD 750 1950 1951 old 2 north from Prince Frederick, bypassed in 1940-1946
MD 750 1947
← US 213 (part)
1955 Old Route 50, Vienna
MD 751 1955 1955
→ 260 (part)
MD 752 1952 (per bridge)
← 231 (part)
now
MD 753 1946 1977 Pylesville-Street
MD 754 1946
← 646 (part)?
1977 Street-east
MD 755 1967
← 24 (part)
now
MD 755 when? when? in Laurel
MD 756 1946
→ US 113 (part)
now unlabeled in 1939-1940
MD 757 1946 1949
→ 673 (part)
former 413 east from Westover
unlabeled in 1934-1940 (was it part of 598?)
MD 758 2012 (HLR) now
MD 759 1952
8 (part)?
now current 759B was definitely part of 8, and was created when the CBB opened and 8 was realigned a bit to the east to cross US 50-301 at grade
but were other parts ex-18?
MD 760 1962 now north part had been 503 until 1956-1957
MD 761 when?
← 263 (part)
now
MD 761 1950
← US 301 (part)
1954 only labeled in 1952 and 1953
MD 762 1989
← 162 (part)
now where was 762 originally?
MD 763 when?
← 155 (part)?
now existed by 1978; appears to have been part of 155 by 1933
Hatem Bridge opened in 1940, probably too early for the number to come directly 155 if it was rerouted then
MD 764 when?
← 261 (part)
now
MD 764 1950? 1953
→ 942?
connection to WV 28, Cumberland
MD 765 1956
← 2 (part)
now
MD 768 when?
← 402 (part)
now
MD 768 1950? 1955 Mellott Drive, north from 628
MD 769 1956?
← 201 (part)
now
MD 776 1953 now
MD 778 1965? 1987?
← 2 (part)?
now old 2, bypassed in 1964-1965, but not shown on maps until 1987 (and unlabeled)
MD 779 when?
← 174 (part)
now
MD 781 1984 now
MD 783 1953? now frontage for US 50-301
MD 784 1953? now frontage for US 50-301
MD 785 1953? now frontage for US 50-301
MD 786 1953? 1986 frontage for US 50-301
not on maps but listed on http://www.mdroads.com/routes/780-799.html#md786
MD 787 1956?
← 194
2012 (HLR)
MD 788 1964
← 665 (part)
now no Annapolis inset in 1960-1963
MD 794 1991
← 4 (part)
now was there an earlier 794?
MD 795 1987 now
MD 795 1956?
← 343 (part)
now
MD 796 when?
← 258 (part)
now
MD 797 when? now existed by 1967
MD 798 when?
← 178 (part)
now existed by 1978
MD 800 1960 (per bridge)
← 75 (part)
now
MD 801 1957
← 313 (part)
1987 old 313, south of Galena
MD 802 1973?
← 8 (part)
now
MD 803 1955 1979 Edgar Price Road, Warwick
MD 804 1960
← 64 (part)
now
MD 805 1960
← 60 (part)
now did this include old 418 too?
MD 806 1958
← US 15 (part)
now was 806 also through Lewistown? it was in Frederick
MD 807 1981
← US 220 (part)
now
MD 808 1972
← 27 (part)
now
MD 809 1958
← 273 (part)
1979 old 273, Calvert
MD 810 when? now frontage for 210
was there an earlier 810?
MD 811 1958 1979 Wilson Avenue, Rising Sun
MD 812 1958
← 280 (part)
1982 old 280, Cherry Hill
MD 813 1987
← 313 (part)
now
MD 813 1963
← 276 (part)
1979 old 276, West Nottingham
MD 814 1967 (per bridge)
← 550 (part)
now
MD 815 when?
← 349 (part)
now existed by 1968
MD 816 1970?
← 16 (part)
1970 maps show 16 on its old alignment until 1970, thus never show 816, but http://www.mdroads.com/routes/800-819.html#md816 lists it
MD 817 1958 (per bridge)
← 16-331 (part), 318 (part)
now was this also old 16-331 through Ellwood, bypassed at about the same time?
MD 818 1969
← US 113 (part)
now
MD 819 when?
← 331 (part)
now
MD 820 when?
← 313 (part)
now
MD 821 when?
← 454 (part)?
now
MD 822 2001 (HLR) now
MD 822 1955 1979 Joe Meltz Road, Warwick
MD 823 1962
← 279 (part)
1979 old 279, Elkton
MD 824 1995? now part of US 222 until 1963-1964
MD 825 1959 (per bridge)
← 135 (part)
now
MD 826 1959??
← US 219 (part)?
now
MD 827 when?
← 39 (part)
now
MD 828 when?
larr; 42 (part)
now
MD 830 1950?? (per bridge)
← US 220 (part)
now
MD 831 1957 or 1985? (per bridges)
← 36 (part)
now
MD 831 when?
← 31 (part)
now
MD 832 1978
← 32 (part)
now was there an earlier 832?
MD 833 1966?
← 88 (part)
now
MD 834 1966? now
MD 835 1987 now frontage for US 50-301, 8, 18
MD 835 1953 1958 old US 1, Rising Sun
MD 837 when? now
MD 838 when? when? Wye Island Road, labeled MD 838 in the NBI (new bridge 1990)
MD 843 1959 (per bridges)
← 63 (part)
now
MD 844 1960?
← 77 (part)
now
MD 845 1961
← 34 (part)
now
MD 846 when?
← 64 (part)
now
MD 847 1958 (per bridge)
← 64 (part)
now
MD 849 when?
← 482 (part)?
now
MD 850 1954 (per bridges)
← 26 (part)
now
MD 851 1958 (per bridges)
← 32 (part)
now
MD 852 1959 (per bridges)
← 31 (part)
now
MD 853 1958? (per bridge)
← 194 (part)
now
MD 854 1959 (per bridge)
← 97 (part)
now
MD 855 when?
← US 213 (part)
now
MD 856 when?
← 298 (part)
now
MD 857 1959
← 566 (part)
1987 Medders Road and Rosedale Cannery Road, Still Pond
MD 858 1959 (per bridges)
← 67 (part)
now
MD 859 1963 1987 old 291, Chestertown
MD 863 1962? now
MD 864 when?
← 292 (part)
now
MD 868 when?
← 234 (part)
now
MD 870 1956? now http://www.mdroads.com/routes/mdroutes.txt says it was old 383 (?) with the new bridge from 1953
MD 871 1965?
← 17 (part)
now
MD 872 1965? now frontage for US 340
MD 873 1963? now
MD 874 1975
← 75 (part)
now
MD 877 1975? now frontage for I-70
MD 878 1958? now
MD 879 1964 (per bridge)
← MD 91 (part)
now
MD 880 1975
← 80 (part)
2008 (HLR) Michaels Mill Road, Buckeystown-east
MD 889 1957? now
MD 890 1978 1985 Slade Avenue, Pikesville
unlabeled on maps but listed on http://www.mdroads.com/routes/880-899.html#md889
MD 891 1958 or 1963? 1995 Hollins Ferry Road, Lansdowne
unlabeled on maps but listed on http://www.mdroads.com/routes/880-899.html#md891
MD 894 1966? now
MD 895 1985 1999 (HLR) Lockwood Drive, White Oak-southwest
formerly part of US 29
MD 896 1946
← 278
now
MD 898 1971?
← 28 (part)
1977 not shown as a state road until 1972
not labeled on maps, but listed on http://www.mdroads.com/routes/880-899.html#md898
MD 899 when? now was once part of 28, but may have not been a state road for a while afterwards
MD 901 1954? 1999 (HLR) Whelan Lane, Clarksburg
MD 903 1987? now
MD 904 1960?? now frontage for 97 (now partly 140)
MD 908 1950?? now frontage for US 50-301
definitely existed by 1978
MD 909 1953? now frontage for 424
MD 910 1967?
← 66 (part)?
now
MD 911 1987 now
MD 912 1967
← 282 (part)
1979 Peddlers Lane, Earleville
MD 912A 1967
← 282 (part)
1979 Old Crystal Beach Road, Earleville
MD 913 1968
← 267 (part)
1974 Old 267, Charlestown
MD 914 1978 1993 New Design Road, Frederick (frontage for I-70)
unlabeled on maps but listed on http://www.mdroads.com/routes/900-919.html#md914
MD 915 1971?
← 648 (part)
now old 648, bypassed in 1970-1971, but doesn't appear (unlabeled) until 1978, when the Baltimore inset expands
was Catherine Avenue south from Armiger a state road in 1971-1973?
MD 917 1954?
← 175 (part)
now
MD 918 1969 now
MD 920 1961? now frontage for US 13
MD 921 2009 (HLR) now
MD 922 2001 (HLR)
22 (part)?
now mostly signed as US 1B southbound
MD 924 1989
← 755 (part)
now
MD 925 1956
← US 301 (part)
now unlabeled until 1961; may have been part of 3 (but probably only in 1956, since in 1957 3 was moved back north to its current location?
MD 927 2001? now existed by 1999 (HLR)
MD 927 1970
← 307 (part)
1971 Williamsburg-Federalsburg
not labeled on maps but listed on http://www.mdroads.com/routes/920-939.html#md927
MD 928 1981?
← 609 (part)
now not shown until 1983
MD 929 2005 (HLR) now frontage for US 29
MD 931 1993? now frontage for US 50-301
some pieces to the east might be older
MD 932 2008 (HLR) now
MD 935 1991
← 936 (part)
now former 36, bypassed in 1981-1983
MD 936 1972?
← 36 (part)
now
MD 937 1975 (per bridges)
← 36 (part)
now
MD 939 when? now old 36? http://www.mdroads.com/routes/920-939.html#md939 says there was a former 939 in almost the same place
MD 940 1989 now
MD 942 1954?
← 764
now
MD 943 1995 now lines up with former 143
MD 943 when?
← 243 (part)
1999 (HLR) existed by 1978
MD 944 when?
← 235 (part)
now
MD 945 when?
← 235 (part)
now
MD 946 1973 (per bridge)
← 546 (part)
now
MD 948 1977? now frontage for US 48 (now I-68)
MD 949 1969?
← 49 (part)
now
MD 950 1991 now frontage for US 50
MD 951 1953? (per bridge)
← 53 (part)
now
MD 952 1962 (per bridge) now
MD 953 1985
← 193 (part)
now
MD 954 1987 (per bridge) now frontage for US 50
MD 956 1978
← 9
now unlabeled until 1985
MD 958 1971? now frontage for I-95
MD 963 1971?? now
MD 964 1963?? now
MD 965 1957? now
MD 967 1967
← 458 (part)
now frontage for 5
MD 968 1959? now
MD 969 1959? now connects 168 and I-695
MD 970 1989? 1999 (HLR) Industrial Drive, Gaithersburg
MD 972 1960??
← 458 (part)
now
MD 973 1962
← 459 (part)
now
MD 974 1957
← 556 (part)
now
MD 975 2010 (HLR) now
MD 976 1960??
← US 301 (part), 3 (part)
now
MD 977 1964?? now frontage for 202
MD 978 1959 (per bridges)
← 214 (part)
now
MD 979 when? now
MD 980 1962? now frontage for 4
MD 981 1997?
← 108 (part)
now was there an earlier 981?
MD 983 1971?
← 216 (part)
now
MD 984 when? now
MD 985 1967?
← 99 (part)
now
MD 986 when? now frontage for US 29
MD 987 1950?
← US 29 (part)
1991
MD 988 when? 1999 (HLR)
MD 990 when? now
MD 991 1962? (per bridge)
← US 50 (part)
now
MD 992 1965? now frontage for US 50
MD 993 when?
← US 1A (part)
now
MD 995 1981 now
MD 996 when? 1999 (HLR) Eggert Drive (frontage for I-495), Cabin John
MD 997 1989? now
MD 998 2007 (HLR) now
MD 999 2001 (HLR) 2002 (HLR) Old Hammonds Ferry Road, Linthicum

The sole source for the existence of the following routes is the log on http://www.mdroads.com/routes/md.html (completely unknown routes are also listed). This concise listing may help with locating more complete or authoritative information.