Hays County is located on the Edwards Plateau in the U.S. state of Texas. Hays County is part of the Austin-Round Rock metropolitan area. As of the 2010 census, its official population had reached 157,107. The county seat is San Marcos. Hays, along with Comal and Kendall Counties, was listed in 2017 as one of the nation's fastest-growing large counties with a population of at least 10,000. From 2015 to 2016, Hays County, third on the national list, had nearly 10,000 new residents during the year. Comal County, sixth on the list, grew by 5,675 newcomers, or 4.4%. Kendall County, the second-fastest growing county in the nation, grew by 5.16%. As a result of this growth, the counties have experienced new home construction, traffic congestion, and greater demand for public services. Bexar County, which includes San Antonio, grew by 1.75% during the year, but its sheer number of new residents exceeded 33,000.
According to the U.S. Census Bureau, the county has a total area of 680 sq mi , of which 678 square miles are land and 1.9 sq mi are covered by water.
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