Jefferson County is the most
populous county in Alabama, with its county seat being located in Birmingham.[ As of the 2000 U.S. Census, the population of Jefferson County was 662,047, but the July 2009 estimate is 665,027. Jefferson County is the most populous and the principal county in the Birmingham metropolitan area.
Jefferson County was established on December 13, 1819, by the Alabama Legislature. It was named in honor of
Thomas Jefferson. The county is located in the north-central portion of the state, on the southmost edge of the Appalachian Mountains, in the center of the iron, steel, coal, and limestone mining belt of the Southern United States. Jefferson County is bordered by Blount County, Bibb County, St. Clair County, Shelby County,
Tuscaloosa County, and Walker County, in Alabama. Jefferson County was established on
December 13, 1819, by the Alabama Legislature. It was named in honor of Thomas Jefferson. The county is located in the north-central portion of the state, on the southmost edge of the Appalachian Mountains, in the center of the iron, steel, coal, and limestone mining belt of the Southern United States. Jefferson County is bordered by Blount County, Bibb County, St. Clair County, Shelby County, Tuscaloosa County, and Walker County, in Alabama.