Founded in 1873, Gregg County is one of 254 counties in the state of Texas. Historically, Gregg County was formed from Upshur County. The city of Longview is the county seat. With FIPS code of 183, Gregg County has a population of 124,201 and area of 274 square miles (710 km2).
List of all cities in Gregg County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Clarksville City, TX | 75693 | 903/430 |
| Easton, TX | 75641 | 903/430 |
| Gladewater, TX | 75647 | 903/430 |
| Greggton, TX | 75604 | 903/430 |
| 75605 | 903/430 | |
| Judson, TX | 75660 | 903/430 |
| Kilgore, TX | 75662 | 903/430 |
| 75663 | 903/430 | |
| Lakeport, TX | 75603 | 903/430 |
| Liberty City, TX | 75662 | 903/430 |
| Longview, TX | 75601 | 903/430 |
| 75602 | 903/430 | |
| 75603 | 903/430 | |
| 75604 | 903/430 | |
| 75605 | 903/430 | |
| 75606 | 903/430 | |
| 75607 | 903/430 | |
| 75608 | 903/430 | |
| 75615 | 903/430 | |
| Longview Heights, TX | 75601 | 903/430 |
| Pinewood, TX | 75602 | 903/430 |
| Tenneryville, TX | 75601 | 903/430 |
| White Oak, TX | 75693 | 903/430 |