13 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Beaumont | 1 | 112,396 | 114,879 | -0.44% | 1,368 | 82 | City |
| Port Arthur | 2 | 55,746 | 56,011 | -0.09% | 738 | 76 | City |
| Nederland | 3 | 18,006 | 18,813 | -0.89% | 3,177 | 6 | City |
| Groves | 4 | 16,757 | 17,299 | -0.65% | 3,214 | 5 | City |
| Port Neches | 5 | 13,715 | 13,682 | 0.04% | 1,596 | 9 | City |
| Central Gardens | 6 | 3,447 | 3,621 | -1.71% | 1,367 | 3 | CDP |
| Hamshire | 7 | 1,960 | 1,126 | 7.16% | 659 | 3 | CDP |
| Fannett | 8 | 1,521 | 2,176 | -3.12% | 155 | 10 | CDP |
| China | 9 | 1,299 | 1,293 | 0.08% | 974 | 1 | City |
| Beauxart Gardens | 10 | 1,079 | 866 | 7.15% | 1,263 | 1 | CDP |
| Bevil Oaks | 11 | 1,035 | 1,087 | -1.05% | 508 | 2 | City |
| Nome | 12 | 470 | 469 | 0% | 403 | 1 | City |
| Taylor Landing | 13 | 288 | 278 | 0.7% | 254 | 1 | City |
Beaumont is the largest city in Jefferson County, with a population of 112,396.
Taylor Landing is the smallest city in Jefferson County, with a population of 288.
There are 13 cities in Jefferson County, Texas.