| Locality | Post Code |
|---|---|
| Bells, Grayson | 75414 |
| Collinsville, Grayson | 76233 |
| Denison, Grayson | 75020, 75021 |
| Dorchester, Grayson | 75459 |
| Fink, Grayson | 75076 |
| Gordonville, Grayson | 76245 |
| Gunter, Grayson | 75058 |
| Howe, Grayson | 75459 |
| Knollwood, Grayson | 75092 |
| Pottsboro, Grayson | 75076 |
| Sadler, Grayson | 76264 |
| Sherman, Grayson | 75090, 75092 |
| Southmayd, Grayson | 76268 |
| Tioga, Grayson | 76271 |
| Tom Bean, Grayson | 75489 |
| Van Alstyne, Grayson | 75495 |
| Whitesboro, Grayson | 76273 |
| Whitewright, Grayson | 75491 |