| Post Office | Zip / * | Established | first precancels Authorized | Discontinued | Notes |
| Aransas Pass [2] (1892-1897) | in Aransas County |
| ARANSAS PASS [2] | 78336 | 2/12/1897: Wheat | yes | operating | city in San Patricio-Aransas-Nueces Counties, Post Office in San Patricio County |
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| CORPUS CHRISTI | city in Nueces-San Patricio-Kleberg Counties, post office in Nueces County |
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| EDROY | 78352 | | none | operating | |
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| Gregory (1887-1893) | in Aransas County |
| GREGORY | 78359 | 7/17/1893: Wheat | none | operating | from Aransas County |
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| INGLESIDE | 78362 | | yes | operating | city in San Patricio-Nueces Counties, post office in San Patricio County |
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| MATHIS | 78368 | | yes | operating | Main Office, 121 S Bee St, M-F 8-4:30 9-10, 361-547-3061 |
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| ODEM | 78370 | | yes | operating | |
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| PORTLAND | 78374 | | yes | operating | city in San Patricio-Nueces Counties, post office in San Patricio County |
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| San Patricio | | 5/17/1848: Wheat | | 3/13/1862: Wheat | |
| San Patricio | | 3/13/1862: Wheat | | 6/7/1866: Wheat | Confederate administration |
| San Patricio | * | 6/7/1866: Wheat | | 9/30/1929: Wheat | discontinued, mail to Mathis, city in San Patricio-Nueces Counties, post office was in San Patricio County |
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| SINTON | 78387 | | yes | operating | |
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| TAFT | 78390 | | yes | operating | |
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