13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Beaumont | 1 | 110,417 | 114,857 | -0.8% | 1,344 | 82.14 | City |
| Port Arthur | 2 | 55,243 | 56,002 | -0.27% | 731 | 75.55 | City |
| Nederland | 3 | 17,652 | 18,816 | -1.3% | 3,115 | 5.67 | City |
| Groves | 4 | 16,408 | 17,297 | -1.07% | 3,148 | 5.21 | City |
| Port Neches | 5 | 13,531 | 13,681 | -0.22% | 1,574 | 8.59 | City |
| Central Gardens | 6 | 3,447 | 3,621 | -1.71% | 1,367 | 2.52 | CDP |
| Hamshire | 7 | 1,960 | 1,126 | 7.16% | 659 | 2.98 | CDP |
| Fannett | 8 | 1,521 | 2,176 | -3.12% | 155 | 9.80 | CDP |
| China | 9 | 1,277 | 1,289 | -0.16% | 958 | 1.33 | City |
| Beauxart Gardens | 10 | 1,079 | 866 | 7.15% | 1,263 | 0.85 | CDP |
| Bevil Oaks | 11 | 1,010 | 1,087 | -1.46% | 495 | 2.04 | City |
| Nome | 12 | 459 | 471 | -0.43% | 394 | 1.17 | City |
| Taylor Landing | 13 | 284 | 278 | 0.35% | 251 | 1.13 | City |
Beaumont is the largest city in Jefferson County, with a population of 110,417.
Taylor Landing is the smallest city in Jefferson County.
There are 13 cities in Jefferson County, Texas.