King William County, VA Property Tax: $1,733/yr (2026)
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The effective property tax rate in King William County is 0.63% of assessed home value. On a home at the county median value of $276,500, that works out to about $1,742 per year, or $145 per month. King William County is located in eastern Virginia, with King William as its county seat, and is home to approximately 18,232 residents.
About King William County
King William County covers approximately 273.9 square miles in Virginia. The county is home to about 18,232 residents living in roughly 7,605 housing units, of which 83.1% are owner-occupied. The median household income is $85,212, and the median home was built in 1995.
The county seat is King William. King William County borders Caroline County, Hanover County, King and Queen County, New Kent County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in Virginia
Property taxes in Virginia are administered at the county level. Each county sets a millage rate applied to the assessed value of real property — the effective rate above accounts for any partial assessments and exemptions already built into the local tax base. Assessed value can differ meaningfully from current market value depending on how often the county reassesses and what fraction of market value it uses.
Most counties in Virginia offer exemptions that reduce the taxable assessed value: homestead exemptions for primary residences, senior exemptions, disability exemptions, and veteran exemptions are common. These reduce your effective rate below the county-wide average shown here. Contact the King William County Assessor's office to learn which exemptions apply to your property and when to file.
King William County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| King William County, VA | 0.63% | $276,500 | $1,742 |
| Virginia state average | 0.67% | — | $1,853* |
| Caroline County | 0.56% | $283,100 | $1,585 |
| Hanover County | 0.67% | $372,700 | $2,506 |
| King and Queen County | 0.52% | $240,900 | $1,261 |
| New Kent County | 0.68% | $371,500 | $2,523 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at King William County's median home value of $276,500. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does King William County's property tax rate compare to the rest of Virginia?
At 0.63%, King William County is lower than the Virginia state average of 0.67%. On a home at the county median of $276,500, that means about $1,742 per year — versus $1,853 at the state average rate, a difference of $111 per year. Compared to the national average of 1.10%, King William County is below average.
What's a typical annual property tax bill in King William County?
For a home at the county median value of $276,500, the annual property tax in King William County is approximately $1,742 — or about $145 per month. For a home worth $414,750, expect around $2,613 per year. For a $553,000 home, approximately $3,484 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a King William County property tax assessment?
Property assessment appeals in King William County are handled by the King William County Assessor's office in King William. Most jurisdictions require filing within 30–90 days of receiving your assessment notice — confirm the specific deadline with the assessor's office before submitting, as deadlines and procedures vary by county. A successful appeal can reduce your assessed value and lower your tax bill for the current and future tax years.
What exemptions are available in King William County?
Virginia counties commonly offer homestead exemptions for owner-occupied primary residences, senior citizen exemptions for qualifying homeowners aged 65 and older, exemptions for disabled residents, and veterans' exemptions. Each exemption reduces your assessed taxable value, which in turn reduces your effective tax rate below the county-wide 0.63% shown here. Contact the King William County Assessor's office to confirm which exemptions are available and the application deadlines.
Data sources: US Census Bureau ACS 2023 5-Year Estimates, US Census Gazetteer (2024), County Adjacency File