Lexington, consolidated with Fayette County, is the second-largest city in Kentucky and the 61st largest in the United States. Known as the "Horse Capital of the World", it is the heart of the state's Bluegrass region. With a mayor-alderman form of government, it is one of two cities in Kentucky designated by the state as first-class; the other is the state's largest city of Louisville. In the 2014 U.S. Census Estimate, the city's population was 310,797, anchoring a metropolitan area of 489,435 people and a combined statistical area of 708,677 people.