| Place Name | Karnack |
| Place Type | Unincorporated |
| ZIP Code(s) | 75661 |
| County | Harrison County |
| Area Code(s) | 430,903 |
| Timezone | Central Daylight Time (CDT) |
| Population () | |
| Metro/Micro Stats Area | Longview, TX |
| US Congressional District(s) | Texas 1st |
| State House Districts | 7 |
| State Senate Districts | 1 |