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San Marcos ( SAN MAR-kəs) is a city and the county seat of Hays County, Texas, United States. The city's limits extend into Caldwell and Guadalupe Counties, as well. San Marcos is within the Austin–Round Rock–San Marcos metropolitan area and on the Interstate 35 corridor between Austin and San Antonio. Its population was 44,894 at the 2010 census and was an estimated 64,776 in 2019.
Founded on the banks of the San Marcos River, the area is thought to be among the oldest continuously inhabited sites in the Americas. San Marcos is home to Texas State University and the Meadows Center for Water and the Environment.
In 2010, San Marcos was listed in Business Week's fourth annual survey of the "Best Places to Raise your Kids". In 2013 and 2014, the United States Census Bureau named it the fastest-growing city in the United States. In December 2013, it was named number nine on Business Insider's list of the "10 Most Exciting Small Cities In America".
San Marcos is in Central Texas. It is 30 miles (48 km) southwest of Austin and 51 miles (82 km) northeast of San Antonio. According to the United States Census Bureau, in 2010, it had a total area of 30.3 square miles (78.6 km2), of which 30.2 square miles (78.3 km2) were land and 0.1 square miles (0.3 km2), or 0.44%, was covered by water. Interstate 35 is the main highway through it, with access from exits 199 through 208.