Alabama's 4th congressional district is a U.S. congressional district in Alabama, which elects a representative to the United States House of Representatives. It encompasses the counties of Lauderdale, Colbert, Franklin, Marion, Lamar, Fayette, Walker, Winston, Cullman, Marshall, DeKalb, and Blount counties. It also includes parts of Lauderdale and Tuscaloosa counties, as well as parts of the Decatur Metropolitan Area and the Huntsville-Decatur Combined Statistical Area.