Dallas is the the ninth most populous city in the United States of America and the third most populous city in the state of Texas. The Dallas-Fort Worth metroplex is the largest metropolitan area in the American South and fourth-largest metropolitan area in the United States. Divided between Collin, Dallas, Denton, Kaufman, and Rockwall counties, the city had a population of 1,197,816 in 2010, according to the United States Census Bureau.