This is a list of numbered county roads in Lennox and Addington County, Ontario.
| County Road # | Local Name(s) | Western/Northern Terminus | Eastern/Southern Terminus | Settlements served | Additional Notes |
|---|---|---|---|---|---|
| 1 | County Road 1 West
Bridge Street West, Belleville Road (Napanee) |
Deseronto Road (County Road 10) (Hastings County limits) | Camden-Portland Boundary Road (Frontenac County limits) | Napanee, Newburgh, Camden Eas, Yarker | West portion formerly provincial highway 502 |
| 2 | County Road 2 Dundas Street East and Dundas Street Wes (Napanee), Main Street Odessa, |
Deseronto Road (Hastings County limits) | Neil Road (Frontenac County limits) | Napanee, Odessa | Formerly Highway 2 (main east-west provincial highway), decertified 1998. Continues west as Dundas Street, Deseronto, and east as Princess Street, Kingston |
| 3 | County Road 3 | Cold Water Road (Hastings County limits) | County Road 41 | Marlbank, Erinsville | Continues as Napanee Road, Queen Street and Napanee Road in Hastings, and becomes County Road 13 |
| 4 | County Road 4 County Road 4W |
County Road 41 | Highway 33 | Millhaven, Camden East, Centreville, Tamworth | West of Tamworth the road becomes County Road 4W |
| 5 | Palace Road County Road 5 |
County Road 2 | County Road 4 | Napanee | Palace Road name changes to County Road 5 at Highway 401 |
| 6 | County Road 6 | County Road 14 | Highway 33 | Amherstview, Odessa, Yarker, Colebrook, Moscow, | |
| 7 | County Road 7 | County Road 2 | Highway 33 | Bath | |
| 8 | County Road 8 | River Road/Palace/Centre Street South Intersection (Napanee) | Highway 33 | Adolphustown, Napanee | |
| 9 | River Road County Road 9 |
County Road 8/Palace/Centre Street South Intersection (Napanee) | County Road 8 | Napanee, Greta, Bethany, Huff Wharf, Watercombe | |
| 10 | Deseronto Road | Kennelly Road (Hastings) / County Road 11 | Dundas Street (Deseronto)/County Road 2 | This road is the boundary between Lennox and Hastings counties. | |
| 11 | County Road 11 | Deseronto Road (County Road 10) (Hastings County limits) | Main Street (County Road 27) | Selby, Newburgh | |
| 12 | County Road 12
Deseronto Road |
Deseronto Road (Hastings County limits) | County Road 41 | Forest Mills | A small section of Deseronto Road from County Road 12 to Enright is held under the jurisdiction of the County of Lennox and Addington as County Road 12 |
| 13 | County Road 13 | County Road 41 | Youngs Road | Erinsville | |
| 14 | County Road 14 | County Road 41 | Deerhurst Lane | Reidville, Enterprise | |
| 15 | County Road 15
Concession Street North |
Frontenac County limits | County Road 4 | Gull Creek, Tamworth | continues north to Highway 7 as Arden Road in Frontenac County |
| 16 | County Road 16 | County Road 11 | County Road 1 | none | minor connecting route |
| 17 | County Road 17 | County Road 4 | County Road 27 | Newburgh | minor connecting route |
| 18 | County Road 18 | County Road 1 West | County Road 5 | none | minor connecting route |
| 19 | County Road 19 (Mud Lake Road North) | County Road 6 | Howes Road | Odessa | |
| 20 | County Road 20 | County Road 6 | Florida Road | Wilton | |
| 21 | County Road 21 | County Road 8 | Highway 33 | Galts Corner | minor connecting route |
| 22 | County Road 22 | County Road 8 | County Road 7 | Millers Corners | |
| 23 | Taylor Kidd Boulevard | County Road 4 | County Road 24 | Amherstview, Millhaven | extension of Kingston suburban route as Taylor Kidd Boulevard, then becomes John Counter Boulevard in Kingston (proper) |
| 24 | Coronation Boulevard | Woodbine Road (Kingston) | Highway 33 | Amherstview | western boundary of Kingston (Collins Bay), eastern boundary of Lennox County (Amherstview) |
| 25 | County Road 25 | South Shore Road | County Road 8 | The Pines | |
| 26 | Jim Snow Drive | Taylor Kidd Boulevard (County Road 23) | Highway 33 | Millhaven | minor connecting route, serves a Bombardier factory near Millhaven |
| 27 | County Road 7 | County Road 14 | County Road 1 | Croydon, Newburgh | |
| 28 | Millhaven Road | County Road 4 | County Road 6 | Links Mills, Asselstine, Odessa | |
| 29 | Flinton Road | Hastings County limits | Highway 41 | Flinton, Flinton Corners | continues through Hastings County as Flinton Road to Highway 7 |
| 30 | Buckshot Lake Road | Highway 41 | Frontenac County limits | Vennachar, Vennachar Junction | veers into Hastings County briefly near Russ Brown Road; continues through Hastings County to Plevna |
| 41 | County Road 41 Centre Street North Centre Street South |
Palace Road/River Road/County Road 8 intersection, Napanee | Highway 7 | Kaladar, Napanee | continues north as Highway 41 to Pembroke and south as Lennox and Addington County Road 8 to Adolphustown |