Jefferson County, Alabama

Jefferson County
County
Jefferson County Courthouse in Birmingham
Location within the U.S. state of Alabama
Alabama's location within the U.S.
Coordinates: 33°31′N 86°49′W / 33.52°N 86.81°W / 33.52; -86.81
Country	United States
State	Alabama
Founded	December 13, 1819[1]
Named for	Thomas Jefferson
Seat	Birmingham
Largest city	Birmingham
Area
• Total	1,124 sq mi (2,910 km2)
• Land	1,111 sq mi (2,880 km2)
• Water	13 sq mi (30 km2)  1.1%
Population  (2020)
• Total	674,721
• Estimate  (2023)	662,895
• Density	600/sq mi (230/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional districts	6th, 7th
Website	jeffconline.jccal.org
County Number 01 on Alabama License Plates One of three counties shuffled to the top 3 numbers because of population size.[2]

Jefferson County is the most populous county in the U.S. state of Alabama, located in the central portion of the state. As of the 2020 census, its population was 674,721.^[3] Its county seat is Birmingham.^[1] Its rapid growth as an industrial city in the 20th century, based on heavy manufacturing in steel and iron, established its dominance. Jefferson County is the central county of the Birmingham-Hoover, AL Metropolitan Statistical Area.