Mobile is the county seat of Mobile County, Alabama, United States. The population within the city limits was 195,111 as of the 2010 United States Census, making it the third most populous city in Alabama, the most populous in Mobile County, and the largest municipality on the Gulf Coast between New Orleans, Louisiana, and St. Petersburg, Florida.Alabama's only saltwater port, Mobile is located at the head of the Mobile Bay and the north-central Gulf Coast. The Port of Mobile has always played a key role in the economic health of the city beginning with the city as a key trading center between the French and Native Americans down to its current role as the 12th-largest port in the United States. Mobile is the principal municipality of the Mobile metropolitan area. This region of 412,992 residents is composed solely of Mobile County; it is the third-largest metropolitan statistical area in the state. Mobile is the largest city in the Mobile-Daphne−Fairhope CSA, with a total population of 604,726, the second largest in the state., the population within a 60mi radius of Mobile is 1,262,907.Mobile began as the first capital of colonial French Louisiana in 1702. During its first 100 years, Mobile was a colony of France, then Britain, and lastly Spain. Mobile first became a part of the United States of America in 1813, with the annexation of West Florida under President James Madison. In 1861 Alabama joined the Confederate States of America, which surrendered in 1865.