Founded in 1836, Washington County is one of 254 counties in the state of Texas. Historically, Washington County was one of the original 23 counties. The city of Brenham is the county seat. With FIPS code of 477, Washington County has a population of 35,891 and area of 609 square miles (1,577 km2).
List of all cities in Washington County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Brenham, TX | 77833 | 979 |
| Brenham, TX | 77834 | 979 |
| Burton, TX | 77835 | 979 |
| Chappell Hill, TX | 77426 | 979 |
| Gay Hill, TX | 77833 | 979 |
| Independence, TX | 77833 | 979 |
| Washington, TX | 77880 | 936 |