Mobile is a city and the county seat of Mobile County, Alabama, United States. The population was 187,041 at the 2020 census. After a successful vote to annex areas west of the city limits in July 2023, Mobile's population increased to 204,689 residents, making it the fourth-most populous city in Alabama, after Montgomery, Birmingham, and Huntsville. Mobile is the principal municipality of the Mobile metropolitan area, a region of 430,197 residents composed of Mobile and Washington counties; it is the third-largest metropolitan area in the state after Birmingham and Huntsville.