Huntsville–Decatur–Albertville combined statistical area

Greater Huntsville
Combined statistical area
Huntsville–Decatur–Albertville, AL combined statistical area
U.S. Space & Rocket Center in Huntsville
Map of Huntsville–Decatur–Albertville, AL–TN CSA   Huntsville metropolitan area   Decatur metropolitan area   Albertville micropolitan area   Fort Payne micropolitan area   Fayetteville micropolitan area   City of Huntsville   City of Decatur
Coordinates: 34.650°N 86.787°W / 34.650; -86.787
Country	United States
State	Alabama Tennessee
Metro areas	Huntsville Metropolitan Area Decatur Metropolitan Area Albertville Micropolitan Area Fort Payne Micropolitan Area Fayetteville Micropolitan Area
Core cities	Huntsville Decatur Albertville
Constituent counties	DeKalb, Lawrence, Limestone, Lincoln, Madison, Marshall, Morgan
Area
• Total	4,710 sq mi (12,200 km2)
• Land	4,545 sq mi (11,770 km2)
• Water	164 sq mi (420 km2)
Population
• Total	852,756
Time zone	UTC-6 (CST)
• Summer (DST)	UTC-5 (CDT)

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The Huntsville–Decatur–Albertville combined statistical area is the most populated sub-region of North Alabama, and is the second largest combined statistical area in the U.S. state of Alabama, after Birmingham–Cullman–Talladega. The Huntsville–Decatur–Albertville, AL–TN CSA had an estimated population of 931,245 in 2025, ranking 67th in the country.

The CSA is situated along the Tennessee River, and is made up of two separate metropolitan areas (Decatur and Huntsville) and 3 micropolitan areas (Albertville, Fort Payne, and Fayetteville). The Decatur MSA, Albertville μSA, and Fort Payne μSA are south of the Tennessee River and the Huntsville MSA and Fayetteville μSA are north of it.

Significant cities included in the CSA include Albertville, Arab, Athens, Boaz, Decatur, Fayetteville, Fort Payne, Guntersville, Hartselle, Huntsville, and Madison, as well as DeKalb, Lawrence, Limestone, Lincoln, Madison, Marshall, and Morgan counties.

As of 2025, Huntsville is the largest city in the CSA with an estimated population of 233,627, and a metro population of 556,444. Madison is the second largest city with a population of 67,968 people; Decatur is the principal city of the second largest metro in the CSA, with a city population of 58,056 and a metro population of 160,326. Mooresville is the smallest town in the CSA with a population of 47.