State Route 9 (SR 9) is one of the longest state highways in the U.S. state of Alabama. From the Florida state line north to Montgomery, SR 9 is the unsigned partner route of U.S. Route 331 (US 331). As a signed route, the southern terminus of SR 9 is at its junction with US 231 and SR 21 at Wetumpka, and the northern terminus of the route is at the Georgia state line east of Cedar Bluff, where the route becomes State Route 20 (SR 20).