King William County, Virginia
| King William County | |
|---|---|
| King William County Courthouse, the oldest in continuous use in the United States | |
| Location within the U.S. state of Virginia | |
| Virginia's location within the U.S. | |
| Coordinates: 37°43′N 77°05′W / 37.71°N 77.09°W | |
| Country | United States | 
| State | Virginia | 
| Founded | 1702 | 
| Named after | William III | 
| Seat | King William | 
| Largest town | West Point | 
| Area | |
|  • Total | 286 sq mi (740 km2) | 
| • Land | 274 sq mi (710 km2) | 
| • Water | 12 sq mi (30 km2) 4.1% | 
| Population  (2020) | |
|  • Total | 17,810 | 
| • Density | 62/sq mi (24/km2) | 
| Time zone | UTC−5 (Eastern) | 
| • Summer (DST) | UTC−4 (EDT) | 
| Congressional district | 1st | 
| Website | www | 
King William County is a county located in the U.S. state of Virginia. As of the 2020 census, the population was 17,810. Its county seat is King William. King William County is located in the Middle Peninsula and is included in the Greater Richmond Region.