Useful Information
Houston City Info
Houston is the largest city in the state of Texas and the fourth-largest in the United States. The city is also large in geographic area; it covers more than 600 square miles (1,558.4 km?) and is the county seat of Harris County?the third most populous in the country. Houston is one of 11 U.S. global cities as it is ranked "Gamma World City" by the Globalization and World Cities Study Group & Network.Houston is world renowned for its energy (particularly oil) and aeronautics industries and for its ship channel. The Port of Houston is the sixth-largest port in the world and is the busiest port in the United States in foreign tonnage and second in overall tonnage. Second only to New York City in Fortune 500 headquarters, Houston is the seat of the internationally-renowned Texas Medical Center, which contains the world's largest concentration of research and healthcare institutions.