| Post Office | Zip / * | Established | first pre- cancels autho- rized | Discontinued | Notes |
| BELLS | 75414 | | yes | operating | |
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| COLLINSVILLE | 76233 | | yes | operating | |
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| DENISON | 75020 | | yes | operating | Main Office, 231 W Woodard St, M-F 8:30-5 Sat 9-12, 903-465-1464 |
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| Dorchester | * | | yes | | |
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| GORDONVILLE | 76245 | | yes | operating | |
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| GUNTER | 75058 | | yes | operating | Main Office, 500 W Main St, M-F 8:30-12 Sat 8:30-10:30, 903-433-3725 |
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| HOWE | 75459 | | yes | operating | Main Office, 101 W Haning St, M-F 8-11:30 1-4:30, 903-532-5431 |
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| POTTSBORO | 75076 | | yes | operating | Main Office, 509 W FM 996, M-F 8:15-4:15 Sat 8:15-10, 903-786-2522 |
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| SADLER | 76264 | | yes | operating | |
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| SHERMAN | 75090 | | yes | operating | COUNTY SEAT named for Gen. Sidney Sherman by legislative action, Main Office, 701 E Peyton St, M-F 8:30-5 Sat 8:30-12, 903-892-9234 |
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| SOUTHMAYD | 76268 | | none | operating | Main Office, 102 Christi Ln, M-F 7:45-12 1-4:15, 903-893-7438 |
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| TIOGA | 76271 | | yes | operating | |
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| TOM BEAN | 75489 | | none | operating | |
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| VAN ALSTYNE | 75095 | | yes | operating | city in Grayson-Collin Counties, post office in Grayson County, city annexed into Collin County 9/13/83, change not reported in 1990 census, Main Office, 101 E Jefferson St, M-F 8:30-4:30 Sat 9-11, 903-482-5221 |
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| WHITESBORO | 76273 | | yes | operating | |
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| WHITEWRIGHT | 75491 | | yes | operating | town in Grayson-Fannin Counties, post office in Grayson County |
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