Columbus is a city in and the county seat of Muscogee County, Georgia, United States, with which it is consolidated. In 2008, its estimated population was 186,984. It is the principal city of the Columbus, Georgia metropolitan area, which, in 2008, had an estimated population of 287,653. It joins with the Auburn, Alabama metropolitan area to form the Columbus, Georgia-Auburn, Alabama Combined Statistical Area, which, in 2008, had an estimated population of 442,953. It is the third largest city and fourth largest metro area in the state, and also the 120th largest city in the U.S. Columbus lies 100 miles (160 km) south of Atlanta. Fort Benning, a major employer, is located south of the city in Chattahoochee County. The city is home to museums and other tourism sites. The area is served by the Columbus Metropolitan Airport. The mayor is Jim Wetherington, who was elected in 2006. The city was ranked number 4 on the 100 Best U.S. Cities to live by Best Life Magazine.