Founded in 1975, Manassas is one of 38 independent cities in the state of Virginia. Historically, Manassas was formed from Prince William County. With FIPS code of 683, Manassas has a population of 42,708 and area of 10 square miles (26 km2).
List of all cities in Manassas City County, VA alphabetically
| City/Town | Postal Code | Area Code |
| Manassas, VA | 20108 | 703/571 |
| 20110 | 703/571 |