Jefferson County, Alabama
Jefferson 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 | |
| Country | United States |
| State | Alabama |
| Founded | December 13, 1819 |
| Named after | 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 |
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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. Its county seat is Birmingham. 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.