King County area

Population and density of King County

The Census Bureau estimates that 192 people lived in King County on July 1, 2025. That ranks #3,220 of 3,222 county equivalents nationally and #253 of 254 in Texas. Since the April 1, 2020 estimates base of 262, the population has declined by 70 (−26.7%), compared with +8.8% for Texas as a whole.

With 910.9 square miles of land, that is 0.21 people per square mile (0.081 per km²), placing King County #3,213 nationally for density and #253 in Texas. The median county equivalent has 47 people per square mile; the Texas median is 22. Put another way, there are about 3,036 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 County

King County has no incorporated cities, towns or villages. All 192 of its residents live in unincorporated communities, which the Census Bureau describes as census-designated places rather than municipalities.

Metropolitan area

King County is not part of any metropolitan or micropolitan statistical area in the Office of Management and Budget’s July 2023 delineation; 1,306 other county equivalents are also outside one. These areas are built around an urban core of at least 10,000 people plus the counties tied to it by commuting, so counties outside them are generally rural.

ZIP codes

2 ZIP Code Tabulation Areas have land in King County; 1 of them have most of their land inside the county, and the others mainly cover neighboring areas.

7923679248

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 County

King County shares a land border with 5 county equivalents. It has more land than 4 of them. The largest neighbor is Stonewall County (916.3 mi²) and the smallest is Foard County (704.4 mi²). Together with its neighbors, King County forms a block of 5,184.5 mi² of land, of which it holds 17.6%.

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

King County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 1.1 times as much. Texas’s county land could hold about 287 areas the size of King County.

Another way to picture it: the same land area would fill a square about 30.2 miles (48.6 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 County?

King County has more land than 2,400 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 County at #923 nationally by total area, 101 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 0.3%, compared with a national county-equivalent median of 1.2% — 0.9 percentage points lower. 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 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.