Jemison is a city in Chilton County, Alabama, United States. At the 2020 census, the population was 2,642. The center of population of Alaba…Jemison is a city in Chilton County, Alabama, United States. At the 2020 census, the population was 2,642. The center of population of Alabama is located outside of Jemison, an area known as Jemison Division.