Houston is a city in Texas.
Harris County is a county located in the U.S. state of Texas . Houston ( [ ˈhjuːstən ] ) is the most populous city in the state of Texas and the fourth-most populous city in the United States . Located in Southeast Texas near the Gulf of Mexico , it is the principal city of the Greater Houston metro area , which is the fifth-most populated MSA in the United States . Houston is the most diverse city in Texas and has been described as the most racially and ethnically diverse major metropolis in the U.S. . The Port of Houston is a port in Houston , Texas , the fourth-largest city in the United States .