Jefferson County is a county located in the U.S. state of Alabama. As of the most recent data available, the county has a population of approximately 662,047 people, with a population density of about 594.83 persons per square mile.
The county spans a total land area of 1,113.00 square miles (2,883.00 square kilometers). The administrative center and county seat is Birmingham, which often serves as a hub for local governance and services. The largest city within the county by population is Birmingham.
Geographically, Jefferson County experiences varied elevations, with its highest point at Vestavia Hills 950 ft and its lowest point at Danville 0 ft. The region operates in the UTC-6.