| Business | Phone |
| Starr County Auditor 401 N Britton Ave 207, Rio Grande City 78582 | (956) 487-8095 |
| Starr County Tax Collector 401 N Britton Ave 205, Rio Grande City 78582 | (956) 487-8139 |
| Starr County Treasurer 401 N Britton Ave, Rio Grande City 78582 | (956) 487-8106 |