10 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Longview | 1 | 84,616 | 81,771 | 0.56% | 1,505 | 56 | City |
| Kilgore | 2 | 13,689 | 13,371 | 0.39% | 735 | 19 | City |
| Gladewater | 3 | 6,384 | 6,152 | 0.61% | 552 | 12 | City |
| White Oak | 4 | 6,250 | 6,223 | 0.08% | 688 | 9 | City |
| Lakeport | 5 | 999 | 977 | 0.4% | 629 | 2 | City |
| East Mountain | 6 | 993 | 905 | 1.53% | 470 | 2 | City |
| Clarksville City | 7 | 796 | 769 | 0.63% | 125 | 6 | City |
| Easton | 8 | 520 | 498 | 0.78% | 213 | 2 | City |
| Union Grove | 9 | 491 | 446 | 1.66% | 525 | 1 | City |
| Warren City | 10 | 323 | 323 | 0% | 185 | 2 | City |
Longview is the largest city in Gregg County, with a population of 84,616.
Warren City is the smallest city in Gregg County, with a population of 323.
There are 10 cities in Gregg County, Texas.