Houston is located in the United States.
Houston . 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 . The Port of Houston is a port in Houston , Texas , the fourth-largest city in the United States . Southeast Texas is a subregion of East Texas located in the southeast corner of the U.S. state of Texas . Texas ( [ ˈtɛksəs ] , [ localˈtɛksᵻz ] Texas or Tejas [ ˈtexas ] ) is the second largest state in the United States by both area and population . United States . The capital is Washington , D.C. , and the largest city is New York City ; nine other major metropolitan areas -- each with at least 4.5 million inhabitants and the largest having more than 13 million people -- are Los Angeles , Chicago , Dallas , Houston , Philadelphia , Miami , Atlanta , Boston , and San Francisco .