U.S. Route 98 (US 98) is an east-west United States highway that runs 671 miles (1,080 km) from the Alabama-Florida state line to southern Florida. It is the longest US road in Florida. It was established in 1933 as a route between Pensacola and Apalachicola, and has since been extended eastward across the Florida Peninsula and westward into Mississippi. It runs along much of the Gulf Coast between Mobile, Alabama and Crystal River, Florida, including extensive sections closely following the coast eastward from the Alabama-Florida state line to St. Marks. At a length of 671 miles, US 98 is the longest numbered route in the state of Florida.