| Business | Phone |
| Rio Grande Chamber Of Commerce 601 E Main St, Rio Grande City 78582 | (956) 487-3024 |
| Rio Grande City Adm 101 S Washington St, Rio Grande City 78582 | (956) 487-4475 |
| Rio Grande City Empowerment Rio Grande City 78582 | (956) 716-8072 |
| Rio Grande City Main St Prgrm 601 E Main St 1, Rio Grande City 78582 | (956) 716-8414 |
| Rio Grande City Municipal Jdg 203 W Water St, Rio Grande City 78582 | (956) 487-8889 |
| Rio Grande City Sewer Plant Po Box 19, Rio Grande City 78582 | (956) 487-3998 |
| Rio Grande City Water Plant Santonino, Rio Grande City 78582 | (956) 487-3459 |