U.S. Route 366 was the designation for two U.S. Numbered Highways in the United States, both of which were related to U.S. Route 66:

U.S. Route 366 marker
U.S. Route 366
Location
CountryUnited States
Highway system
US 360 US 370

See also

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  Media related to U.S. Route 366 at Wikimedia Commons