Madison is a city located primarily in Madison County, near the northern border of the U.S. state of Alabama. Madison extends west into neighboring Limestone County. The city is included in the Huntsville Metropolitan Area, the second-largest in the state, and is also included in the merged Huntsville-Decatur Combined Statistical Area. The population was 56,933 at the 2020 census. Madison is an enclave of Huntsville, which surrounds it on all sides, though there are some small unincorporated lands within Madison in Madison and Limestone counties and along the border with Huntsville.