Founded in 1702, King William County is one of 95 counties in the state of Virginia. Historically, King William County was formed from English colonists formed King William County in 1702 out of King and Queen County, Virginia. The city of King William is the county seat. With FIPS code of 101, King William County has a population of 18,171 and area of 275 square miles (712 km2).
List of all cities in King William County, VA alphabetically
| City/Town | Postal Code | Area Code |
| Aylett, VA | 23009 | 804 |
| Cologne, VA | 23181 | 804 |
| Eltham, VA | 23181 | 804 |
| King William, VA | 23086 | 804 |
| Manquin, VA | 23106 | 804 |
| West Point, VA | 23181 | 804 |