King William County, Virginia Demographics 2026

Population Overview

King William County is located in Virginia with a total population of 18,232. It is the 83rd most populous county out of 133 in Virginia. The county encompasses 3 Census-designated places.

Age Demographics

The median age in King William County is 40.5 years. This is 4% higher than the state median of 38.8 years.

Economy, Income & Housing

The median household income in King William County is $85,212. This is 6% lower than the state median of $90,974. It is also 8% higher than the national median of $78,538. The poverty rate stands at 7.9%. This is 20% lower than the state poverty rate of 9.9%. The unemployment rate is 3.5%. This is 18% lower than the state rate of 4.3%. The median home value is $276,500. Housing costs are 23% lower than the state median of $360,700. The home-value-to-income ratio is 3.2x. 88.8% of occupied housing units are owner-occupied. This homeownership rate is 32% higher than the state average of 67.2%.

Race & Ethnicity

The largest racial or ethnic group in King William County is White (non-Hispanic), making up 77.0% of the population. Black or African American residents account for 15.3%. The Hispanic or Latino population (3.1%) is well below the state average of 10.7%. The Asian population (0.7%) is well below the state average of 6.8%.

Education

24.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 42% lower than the state rate of 41.5%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 93.6%.

Data Sources & Methodology

All figures for King William County come from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023), with comparisons drawn against Virginia and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.