King William County area

Population and density of King William County

The Census Bureau estimates that 19,617 people lived in King William County on July 1, 2025. That ranks #1,910 of 3,222 county equivalents nationally and #82 of 133 in Virginia. Since the April 1, 2020 estimates base of 17,810, the population has grown by 1,807 (+10.1%), compared with +2.9% for Virginia as a whole.

With 273.9 square miles of land, that is 72 people per square mile (28 per km²), placing King William County #1,240 nationally for density and #86 in Virginia. The median county equivalent has 47 people per square mile; the Virginia median is 109. Put another way, there are about 8.9 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in King William County

1 incorporated place lies at least partly in King William County. Together they are home to 3,595 people (18.3%); the other 16,022 (81.7%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is West Point town, with 3,595 residents in the county.

Metropolitan area

King William County is an outlying county of the Richmond, VA Metropolitan Statistical Area. Its 17 county equivalents have 1,389,338 residents on 4,367.8 square miles of land; King William County accounts for 6.3% of the land and 1.4% of the residents. By combined land it ranks #62 of 393 metropolitan areas, and #45 by population.

ZIP codes

6 ZIP Code Tabulation Areas have land in King William County; 4 of them have most of their land inside the county, and the others mainly cover neighboring areas.

230092306923086231062317723181

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering King William County

King William County shares a land border with 4 county equivalents. It has more land than 1 of them. The largest neighbor is Caroline County (527.4 mi²) and the smallest is New Kent County (210 mi²). Together with its neighbors, King William County forms a block of 1,794.1 mi² of land, of which it holds 15.3%.

How big is King William County compared with U.S. states?

King William County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 3.8 times as much. Virginia’s county land could hold about 144 areas the size of King William County.

Another way to picture it: the same land area would fill a square about 16.6 miles (26.6 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about King William County?

King William County has more land than 364 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places King William County at #2,873 nationally by total area, 15 places farther from the top than its land rank. Other county equivalents gain more area when their water measurements are included.

Its water share is 4.2%, compared with a national county-equivalent median of 1.2% — 3 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside King William County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.