County · code 51101
King William CountyVirginia
King William County is a county in Virginia, with its seat in the town of King William. It was formed in 1702 and named after William Iii of England.
- Founded1702
- County seatKing William
- Named forWilliam III of England
- Land area274 sq mi + 12 sq mi water
- Population17,810 2020 Census
- Parcels mapped14,104 checked 15 October 2026
Where it is
King William on the map of Virginia
Virginia has 133 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1702 from King and Queen County
An old deed may name a county that no longer exists, or a boundary that has since moved.
King William County was created on April 11, 1702, from King and Queen County. In 1721, it lost territory to the creation of Spotsylvania County, and in 1728, it lost more territory to the creation of Caroline County.
- 1702King William County created King William created from King and Queen. · Hening 3:211-212
- 1721Lost territory King William lost to creation of Spotsylvania. · Hening, 4:77-79; Robinson, 77; Winfree, 179-185
- 1728
Land and parcels
What the maps cover in King William
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 14,104 parcels from Virginia Geographic Information Network (VGIN), Virginia Department of Emergency Management. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 15 October 2026 -
Address points Official
One point per address, 9,354 in all from Virginia Geographic Information Network (VGIN), Virginia Dept of Emergency Management (VDEM; VGIN moved from VITA to VDEM).
checked 14 October 2026 -
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
King William by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
King William County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of King William County.
See your own lot on these maps
Open King William County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about King William County
- When was King William County founded?
- King William County was founded in 1702, formed from King and Queen County, and named after William III of England.
- What is the county seat of King William County?
- The county seat of King William County is King William.
- Is there an online parcel map for King William County?
- Yes. Virginia Geographic Information Network (VGIN), Virginia Department of Emergency Management publishes a parcel map of 14,104 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has King William County's boundary or name changed?
- King William County was created in 1702 from King and Queen County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Caroline County and Spotsylvania County.
- Is my lot in a flood zone?
- We do not have flood maps for King William County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby