Fort Worth is the 15th-largest city in the United States and the fifth-largest city in the state of Texas. The city is located in North Texas. It is the county seat of Tarrant County, covering nearly 350 square miles (910 km2) into four other counties: Denton, Johnson, Parker and Wise. According to the 2017 census estimates, Fort Worth's population is 874,168. The city is the second-largest in the Dallas–Fort Worth–Arlington metropolitan area (the "DFW Metroplex"), 4th most populous metropolitan area in the United States.