| Official Zip Code Name | Southmayd |
| Zip Code State | Texas |
| Primary County: | Grayson |
| Area Code | 903/430 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 6 |
| Elevation Range | 722 ft. |
| Area | 0.636 Sqm. |
| Coordinates(Y,X) | 33.615344, -96.761827 |