| Business | Phone |
| Drivers License Div 1400 N I H 35, San Marcos 78666 | (512) 353-2770 |
| Public Safety Dept 1400 N I H 35, San Marcos 78666 | (512) 353-4245 |
| Public Safety Dept 1405 United Dr, San Marcos 78666 | (512) 353-4245 |
| Transportation Dept 5080 Fm 2439, San Marcos 78666 | (512) 392-1916 |