10 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Longview | 1 | 84,142 | 81,771 | 0.57% | 1,496 | 56 | City |
| Kilgore | 2 | 13,636 | 13,371 | 0.39% | 733 | 19 | City |
| Gladewater | 3 | 6,345 | 6,152 | 0.6% | 549 | 12 | City |
| White Oak | 4 | 6,245 | 6,223 | 0.06% | 687 | 9 | City |
| Lakeport | 5 | 995 | 977 | 0.3% | 626 | 2 | City |
| East Mountain | 6 | 978 | 905 | 1.45% | 462 | 2 | City |
| Clarksville City | 7 | 791 | 769 | 0.51% | 124 | 6 | City |
| Easton | 8 | 516 | 498 | 0.58% | 211 | 2 | City |
| Union Grove | 9 | 483 | 446 | 1.47% | 517 | 1 | City |
| Warren City | 10 | 323 | 323 | 0% | 185 | 2 | City |
Longview is the largest city in Gregg County, with a population of 84,142.
Warren City is the smallest city in Gregg County, with a population of 323.
There are 10 cities in Gregg County, Texas.