U.S. Highway 90 | ||||
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| Route information | ||||
| Maintained by FDOT | ||||
| Length | 408.723 mi[1][2][3] (657.776 km) | |||
| Existed | 1926–present | |||
| Major junctions | ||||
| West end |  US 90 near Seminole, Alabama | |||
| East end |  SR A1A in Jacksonville Beach | |||
| Location | ||||
| Country | United States | |||
| State | Florida | |||
| Counties | Escambia, Santa Rosa, Okaloosa, Walton, Holmes, Washington, Jackson, Gadsden, Leon, Jefferson, Madison, Suwannee, Columbia, Baker, Nassau, Duval | |||
| Highway system | ||||
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U.S. Route 90 (US 90) in the state of Florida is the northernmost east–west United States Numbered Highway in the state. US 90 passes through the county seats of all 15 counties on its course in Florida, and it is also the road upon which many of the county courthouses are located. It is never more than six miles (9.7 km) from Interstate 10 (I-10) throughout the state. It runs as a two-lane highway through most of the sparsely populated inland areas of the Florida Panhandle, widening to 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 from where it enters Madison County as far as Glen St. Mary.
Like all highways in Florida, US 90 always carries a state road number, which may or may not always be signed. These numbers are assigned by the Florida Department of Transportation (FDOT):
- State Road 10 (SR 10) from the Alabama state line to US 90 Alt./SR 10 east in Jacksonville with one exception:
- SR 10A between the western and eastern termini of US 90 Alt. in Escambia County, which carries SR 10.
- SR 212 from the US 90 Alt./SR 10 interchange in Jacksonville to the eastern terminus at SR A1A in Jacksonville Beach.
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.