12 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Longview | 1 | 84,290 | 81,654 | 0.63% | 1,510 | 55.83 | City |
| Kilgore | 2 | 13,620 | 13,377 | 0.36% | 732 | 18.61 | City |
| Gladewater | 3 | 6,352 | 6,151 | 0.63% | 549 | 11.57 | City |
| White Oak | 4 | 6,223 | 6,217 | 0.02% | 685 | 9.09 | City |
| Lake Cherokee | 5 | 3,407 | 3,283 | 0.65% | 277 | 12.29 | CDP |
| Liberty City | 6 | 3,151 | 2,092 | 1.71% | 517 | 6.09 | CDP |
| Lakeport | 7 | 996 | 978 | 0.4% | 627 | 1.59 | City |
| East Mountain | 8 | 990 | 905 | 1.75% | 468 | 2.12 | City |
| Clarksville City | 9 | 793 | 772 | 0.51% | 124 | 6.37 | City |
| Easton | 10 | 514 | 496 | 0.78% | 210 | 2.44 | City |
| Union Grove | 11 | 480 | 447 | 1.48% | 513 | 0.94 | City |
| Warren City | 12 | 321 | 320 | 0% | 184 | 1.75 | City |
Longview is the largest city in Gregg County, with a population of 84,290.
Warren City is the smallest city in Gregg County.
There are 12 cities in Gregg County, Texas.