Madison County, Alabama

Madison County
Madison County Courthouse in Huntsville
Location within the U.S. state of Alabama
Alabama's location within the U.S.
Coordinates: 34°45′57″N 86°33′28″W / 34.765833333333°N 86.557777777778°W / 34.765833333333; -86.557777777778
Country United States
State Alabama
FoundedDecember 13, 1808
Named afterJames Madison
SeatHuntsville
Largest cityHuntsville
Government
  Commission ChairmanMac McCutcheon
Area
  Total
813 sq mi (2,110 km2)
  Land802 sq mi (2,080 km2)
  Water11 sq mi (30 km2)  1.4%
Population
 (2020)
  Total
388,153
  Estimate 
(2023)
412,600
  Density480/sq mi (180/km2)
Time zoneUTC−6 (Central)
  Summer (DST)UTC−5 (CDT)
Congressional district5th
Websitewww.madisoncountyal.gov
 
  • County Number 47 on Alabama License Plates
  • Largest County by population not shuffled to top 2 on Alabama License Plates

Madison County is a county located in the north central portion of the U.S. state of Alabama. As of the 2020 Census, the population was 388,153, and according to a 2023 population estimate the county has become the second-most populous county in Alabama after only Jefferson County, home to Birmingham. Its county seat is Huntsville. Since the mid-20th century it has become an area of defense and space research and industry. The county is named in honor of James Madison, fourth President of the United States and the first President to visit the state of Alabama. Madison County covers parts of the former Decatur County. Madison County is included in the Huntsville, Alabama Metropolitan Statistical Area.