Post Offices List in Upshur County, Texas:
| Big Sandy Post Office | 210 E Broadway St, Big Sandy, TX 75755 |
| Diana Post Office | 2218 Us Highway 259 S, Diana, TX 75640 |
| Gilmer Post Office | 405 N Cypress St, Gilmer, TX 75644 |
| Ore City Post Office | 203 Us Highway 259 S, Ore City, TX 75683 |