Fort Worth is a city in the U.S. state of Texas. It is the county seat of Tarrant County, covering nearly 350 square miles (910 km²) and extending into Denton, Johnson, Parker, and Wise counties. Fort Worth's population was estimated to be 1,008,156 in 2024, making it the 11th-most populous city in the United States. Fort Worth is the second-largest city in the Dallas–Fort Worth metroplex and the fourth-most populous in Texas. The Dallas–Fort Worth metroplex is the fourth-most populous metropolitan area in the U.S., with 8.5 million residents.