Chelsea is a city in Shelby County, Alabama, United States. It is part of the Birmingham metropolitan area. Chelsea was incorporated on March 1, 1996, with a population of 906. At the 2020 census, the population was 14,982. According to the U.S. Census Bureau, the 2010 population for Chelsea was 10,183, and 14,126 in 2019. Its seasonal campsite and activities for visitors and others living in and around Chelsea