Houston (/ˈhjuːstən/ (listen) HEW-stən) is the most populous city in the U.S. state of Texas and the fourth most populous city in the United States, with a census-estimated population of 2.312 million in 2017. It is the most populous city in the Southern United States and on the Gulf Coast of the United States. Located in Southeast Texas near Galveston Bay and the Gulf of Mexico, it is the seat of Harris County and the principal city of the Greater Houston metropolitan area, which is the fifth most populous metropolitan statistical area (MSA) in the United States and the second most populous in Texas after the Dallas-Fort Worth MSA. With a total area of 627 square miles (1,620 km2), Houston is the eighth most expansive city in the United States (including consolidated city-counties). It is the largest city in the United States by total area, whose government is similarly not consolidated with that of a county or borough. Though primarily in Harris County, small portions of the city extend into Fort Bend and Montgomery counties.