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Hays and Caldwell Region Greater Together Home to Hays County the fastest growing county in Texas and the fastestgrowing county in the country among counties with over 100000 residents the region has been called The Next Great Metropolis by Forbes. Midway between two major metropolitan cities and along two major transportation thoroughfares. 113 N. Guadalupe Street San Marcos Texas 78666 MonFri 8am 5pm Sat Sun Closed 5123933400 Send an email Facebook Twitter YouTube Instagram LinkedIn 2025 Hays Caldwell Economic Development Partnership .