The Hays County Sheriff's Office operates the Hays County Jail in San Marcos, the county seat. The facility processes bookings from the sheriff's office, San Marcos Police Department, Kyle Police Department, Buda Police Department, and other municipal agencies. Booking records, including photographs and charge information, are publicly accessible under the Texas Public Information Act (Tex. Gov’t Code Ch. 552). Hays County provides an online inmate search that is updated as bookings are processed.

San Marcos is both the county seat and the home of Texas State University, which enrolls over 38,000 students and is one of the largest universities in Texas. The university's presence gives the city a youthful demographic and drives a significant portion of local economic activity. Kyle, located just north of San Marcos along I-35, has been one of the fastest-growing cities in the state, growing from roughly 28,000 in 2010 to over 70,000. Buda, farther north along I-35, has experienced similar growth as Austin's suburban ring pushes southward.

About Hays County

Hays County occupies a strategic position along the I-35 corridor between Austin and San Antonio, making it a prime beneficiary of growth in both metro areas. The county's landscape transitions from the flat Blackland Prairie in the east to the rolling Hill Country in the west, where communities like Dripping Springs and Wimberley offer a more rural character. The San Marcos River, a spring-fed waterway that maintains a constant temperature of approximately 72 degrees year-round, is a major recreational draw and the centerpiece of San Marcos. The county's growth has placed increasing pressure on infrastructure, including the jail and court system, leading to ongoing expansion of county facilities.