Chelsea is a city in Shelby County, Alabama, United States. It is part of the Birmingham metropolitan area. Although Chelsea was incorporated on May 16, 1995, it was dissolved shortly thereafter over procedural errors. Another vote was held and the city was once again incorporated on March 1, 1996. According to the U.S. Census Bureau, the 2010 population for Chelsea was 10,183 and 14,126 in 2019. At the 2020 census, the population was 15,908.