U.S. Route 90 in Florida

U.S. Highway 90
Route information
Maintained by FDOT
Length:	408.723 mi (657.776 km)
Existed:	1926 – present
Major junctions
West end:	US 90 near Seminole, Alabama
	I-110 in Pensacola US 27 in Tallahassee I-75 in Lake City I-95 in Jacksonville
East end:	SR A1A in Jacksonville Beach
Location
Counties:	Escambia, Santa Rosa, Okaloosa, Walton, Holmes, Washington, Jackson, Gadsden, Leon, Jefferson, Madison, Suwannee, Columbia, Baker, Nassau, Duval
Highway system
United States Numbered Highway System List Special Divided Replaced Florida State Highway System Interstate US SR Former Pre-1945 Toll Scenic ← SR 89 SR 90 → ← SR 10 SR 11 →

Florida State Road No. 1
U.S. National Register of Historic Places
Location	Santa Rosa County, Florida, USA
Nearest city	Milton, Florida
NRHP Reference #	94000626
Added to NRHP	June 23, 1994

U.S. Route 90 in the State of Florida is the northernmost west-to-east U.S. route in the state although it is one of the southernmost U.S. west-to-east routes in the rest of the United States. Highway 90 passes through the county seats of all 15 counties on its course in Florida, not to mention being the address of almost every county courthouse, and is never more than six miles (10 km) from I-10 throughout the state. It runs as a two-lane highway through most of the sparsely populated inland areas of the panhandle, becoming four-lanes through and near several towns. The speed limit is 55 mph (89 km/h) for all rural points west of Monticello, and it is 60 mph (97 km/h) on all rural points beginning in Madison County to Glen St. Mary.

Like all AASHTO designated highways in Florida, US 90 always carries a FDOT designated state road number, which may or may not always be signed:

Concurrencies include US 98 in Pensacola, US 331 in DeFuniak Springs, US 221 in Greenville, US 301 in Baldwin, and US 1 in Jacksonville. Lesser concurrencies with state and county roads also exist in various parts of the state. The segment between US 319 in Tallahassee and US 441 in Lake City also includes part of the DeSoto Trail.