| Post Office / Place | Zip | USPS category | County | 2000
Census
Population | Notes |
| zipname | 78582 | | | zip |
| RIO GRANDE CITY | 78582 | default | | zip/place |
| EL SAUZ | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| ESCOBARES | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| FORT RINGGOLD | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| GARCENO | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| LA CASITA | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| RINCON | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| RIO GRANDE | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| SANTA CATARINA | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| SANTA CRUZ | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| VILLA REALES | 78582 | not acceptable | | use RIO GRANDE CITY, zip/place |
| rural | 78582 | | | zip/place |
| | 78582 | | STARR | | zip/county |
| Rio Grande City | 78582 | | STARR | | zip/county-place |
| rural | 78582 | | STARR | | zip/county-place |
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