Founded in 1839, Harrison County is one of 254 counties in the state of Texas. Historically, Harrison County was formed from Shelby County. The city of Marshall is the county seat. With FIPS code of 203, Harrison County has a population of 69,150 and area of 899 square miles (2,328 km2).
List of all cities in Harrison County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Baldwin, TX | 75661 | 903/430 |
| Blocker, TX | 75670 | 903/430 |
| Cave Springs, TX | 75670 | 903/430 |
| Darco, TX | 75670 | 903/430 |
| Elysian Fields, TX | 75642 | 903/430 |
| Gill, TX | 75670 | 903/430 |
| Grange Hall, TX | 75670 | 903/430 |
| Hallsville, TX | 75650 | 903/430 |
| Harleton, TX | 75651 | 903/430 |
| Jonesville, TX | 75659 | 903/430 |
| Karnack, TX | 75661 | 903/430 |
| Leigh, TX | 75661 | 903/430 |
| Marshall, TX | 75670 | 903/430 |
| 75671 | 903/430 | |
| 75672 | 903/430 | |
| Nesbitt, TX | 75670 | 903/430 |
| Scottsville, TX | 75688 | 903/430 |
| Uncertain, TX | 75661 | 903/430 |
| Walkers Mill, TX | 75650 | 903/430 |
| Waskom, TX | 75692 | 903/430 |
| Woodlawn, TX | 75694 | 903/430 |