9 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 |
| China | 6 | 1,299 | 1,293 | 0.08% | 857 | 2 | City |
| Bevil Oaks | 7 | 1,035 | 1,087 | -1.05% | 508 | 2 | City |
| Nome | 8 | 470 | 469 | 0% | 403 | 1 | City |
| Taylor Landing | 9 | 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 9 cities in Jefferson County, Texas.