Founded in 1836, Jefferson County is one of 254 counties in the state of Texas. Historically, Jefferson County was one of the original 23 counties. The city of Beaumont is the county seat. With FIPS code of 245, Jefferson County has a population of 253,704 and area of 904 square miles (2,341 km2).
List of all cities in Jefferson County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Beaumont, TX | 77701 | 409 |
| 77702 | 409 | |
| 77703 | 409 | |
| 77704 | 409 | |
| 77705 | 409 | |
| 77706 | 409 | |
| 77707 | 409 | |
| 77708 | 409 | |
| 77709 | 409 | |
| 77710 | 409 | |
| 77713 | 409 | |
| 77720 | 409 | |
| 77725 | 409 | |
| 77726 | 409 | |
| Cheek, TX | 77705 | 409 |
| China, TX | 77613 | 409 |
| Fannett, TX | 77705 | 409 |
| Griffing, TX | 77640 | 409 |
| Griffing Park, TX | 77640 | 409 |
| Groves, TX | 77619 | 409 |
| Hamshire, TX | 77622 | 409 |
| Lakeview, TX | 77640 | 409 |
| Lamar University, TX | 77707 | 409 |
| Nederland, TX | 77627 | 409 |
| Nome, TX | 77629 | 409 |
| Pear Ridge, TX | 77640 | 409 |
| Point Acres, TX | 77640 | 409 |
| Port Acres, TX | 77640 | 409 |
| Port Arthur, TX | 77640 | 409 |
| 77641 | 409 | |
| 77642 | 409 | |
| 77643 | 409 | |
| Port Neches, TX | 77651 | 409 |
| Sabine, TX | 77640 | 409 |
| Sabine Pass, TX | 77655 | 409 |
| Steeltown, TX | 77619 | 409 |
| Taylor Landing, TX | 77705 | 409 |
| West Port Arthur, TX | 77640 | 409 |