King William County, Virginia
Quick answer: King William County is a county in Virginia with its seat at King William. Its estimated population in 2025 was 19,617, up 10.1% since 2020. It covers about 274 square miles of land.
| Type | county |
|---|---|
| County seat | King William |
| Established | 1702 |
| Population, 2025 estimate | 19,617 |
| Population, 2020 estimate | 17,916 |
| Change 2020–2025 | 9.5% |
| Rank by population in Virginia | 82 of 133 |
Overview
Virginia has 95 counties, and King William County is one of them.[1] The county seat is King William.[2] The county was established in 1702.[2] The name comes from William III of England.[2]
Population of King William County
The U.S. Census Bureau estimated the population of King William County at 19,617 in July 2025, up 10.1% from the April 2020 base of 17,810.[1] That made it 82nd of Virginia's 133 counties and independent cities by population. It ranked 10th for growth since 2020.[1]
From 2020 to 2025 the Census Bureau counted about 1,198 births and 967 deaths, a natural increase of 231.[1] More people moved in from other parts of the United States than moved away. Net domestic migration was 1,505. Moves from abroad added 60.[1]
Geography
King William County covers 273.9 square miles of land and 12.0 square miles of water.[3] By land area it ranks 73rd of 133 in Virginia.[3] It had about 72 people per square mile in 2025, so it is mostly rural. Its geographic center lies near 37.71° N, 77.09° W.[3]
The county borders Caroline County, Hanover County, King and Queen County and New Kent County.[4]
The U.S. Geological Survey place-name database lists 43 named streams, 21 lakes and reservoirs and 6 islands in the county.[5]
Towns
King William County has one incorporated town: West Point (3,595), with its estimated 2025 population in brackets.[6] In Virginia, towns remain part of the county around them, unlike independent cities.
Frequently asked questions
What is the county seat of King William County?
King William.
What is the population of King William County?
About 19,617 people in 2025, according to the U.S. Census Bureau.
How big is King William County?
About 274 square miles of land, plus 12.0 square miles of water.
References
- [1] U.S. Census Bureau, County Population Totals and Components of Change: 2020-2025 (Vintage 2025) – last checked 11/08/2026
- [2] Wikidata, King William County, Virginia (open data, CC0) – last checked 11/08/2026
- [3] U.S. Census Bureau, 2024 Gazetteer Files: Counties – last checked 11/08/2026
- [4] U.S. Census Bureau, County Adjacency File (2024) – last checked 11/08/2026
- [5] U.S. Geological Survey, Geographic Names Information System (GNIS), Domestic Names – last checked 11/08/2026
- [6] U.S. Census Bureau, City and Town Population Totals: 2020-2025 – last checked 11/08/2026
Official website: www.kingwilliamcounty.us
Boundary on the map: Census TIGERweb. See all counties and cities on the map.