9 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Beaumont | 1 | 111,900 | 114,879 | -0.44% | 1,362 | 82 | City |
| Port Arthur | 2 | 55,693 | 56,011 | -0.1% | 737 | 76 | City |
| Nederland | 3 | 17,845 | 18,813 | -0.89% | 3,149 | 6 | City |
| Groves | 4 | 16,649 | 17,299 | -0.64% | 3,194 | 5 | City |
| Port Neches | 5 | 13,722 | 13,682 | 0.05% | 1,597 | 9 | City |
| China | 6 | 1,300 | 1,293 | 0.08% | 858 | 2 | City |
| Bevil Oaks | 7 | 1,025 | 1,087 | -0.97% | 503 | 2 | City |
| Nome | 8 | 470 | 469 | 0% | 403 | 1 | City |
| Taylor Landing | 9 | 290 | 278 | 0.69% | 256 | 1 | City |
Beaumont is the largest city in Jefferson County, with a population of 111,900.
Taylor Landing is the smallest city in Jefferson County, with a population of 290.
There are 9 cities in Jefferson County, Texas.