Houston Houston is the fourth-largest city in the United States of America, and the largest city in the state of Texas. According to the 2010 U.S. Census, the city had a population of 2.1 million people within an area of 656.3 square miles (1,700 km). Houston is the seat of Harris County and the economic center of Houston-Sugar land - Baytown, the fifth-largest metropolitan area in the U.S. with over 6 million people.
Dallas is the ninth most populous city in the UnitedStates of America and the third most populous city in the state of Texas. The Dallas-Fort Worthmetroplex is the largest metropolitan area in the South and forth-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.
Waco is a city in and the county seat of McLennan County, Texas, United States.It is situated along the Brazos River and on the I-35 corridor, halfway between Dallas and Austin. The city had a 2010 population of 124,805, an increase of almost 10 percent since the 2000 census, making it the twenty-second most populous city in the state. The Waco Metropolitan Statistical Area consists of just McLennan County, which had a 2010 population of 234,906