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Houston is the largest city in the state of Texas, the fourth-largest in the United States. As of the 2005 U.S. Census estimate, it had a population of more than 2 million. The city covers more than 600 square miles (1,600 km²). Houston is the county seat of Harris County and part of the HoustonSugar LandBaytown metropolitan area, the sixth-largest metropolitan area in the U.S. with a population of more than 5.5 million.
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