| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Longview | 1 | 83,652 | 81,755 | 0.5% | 1,488 | 56 | City |
| Kilgore | 2 | 13,581 | 13,344 | 0.37% | 730 | 19 | City |
| Gladewater | 3 | 6,347 | 6,141 | 0.65% | 549 | 12 | City |
| White Oak | 4 | 6,187 | 6,212 | 0.02% | 681 | 9 | City |
| Lakeport | 5 | 996 | 974 | 0.3% | 627 | 2 | City |
| East Mountain | 6 | 987 | 905 | 1.54% | 467 | 2 | City |
| Clarksville City | 7 | 783 | 762 | 0.51% | 123 | 6 | City |
| Easton | 8 | 509 | 492 | 0.39% | 208 | 2 | City |
| Union Grove | 9 | 483 | 447 | 1.26% | 517 | 1 | City |
| Warren City | 10 | 321 | 321 | 0% | 184 | 2 | City |
Longview is the largest city in Gregg County, with a population of 83,652.
Warren City is the smallest city in Gregg County, with a population of 321.
There are 10 cities in Gregg County, Texas.