Huntsville is a city located in the United States state of Alabama. It serves as the county seat of Madison County, with its boundaries extending into Limestone County, Marshall County, and Morgan County.
The city is the most populous municipality in Alabama. According to 2020 census data, Huntsville had a population of 215,006, while its metropolitan area was estimated at 542,000 residents. As of July 1, 2025, the city's population was estimated to be 249,102, representing a 15.9% increase since the 2020 Census and ranking it among the top 20 fastest-growing cities in the United States.