Clinton County area

Population and density of Clinton County

The Census Bureau estimates that 21,661 people lived in Clinton County on July 1, 2025. That ranks #1,793 of 3,222 county equivalents nationally and #53 of 115 in Missouri. Since the April 1, 2020 estimates base of 21,183, the population has grown by 478 (+2.3%), compared with +1.9% for Missouri as a whole.

With 418.9 square miles of land, that is 52 people per square mile (20 per km²), placing Clinton County #1,515 nationally for density and #36 in Missouri. The median county equivalent has 47 people per square mile; the Missouri median is 31. Put another way, there are about 12 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 Clinton County

8 incorporated places lie at least partly in Clinton County. Together they are home to 12,022 people (55.5%); the other 9,639 (44.5%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Cameron city, with 5,119 residents in the county (the city extends into 2 other counties). The county seat, Plattsburg city, has 2,239 residents. Among places with at least 1,000 residents in 2020, Plattsburg city grew fastest since then (+0.7%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Clinton County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Clinton County is an outlying county of the Kansas City, MO-KS Metropolitan Statistical Area. Its 14 county equivalents have 2,270,682 residents on 7,256.8 square miles of land; Clinton County accounts for 5.8% of the land and 1% of the residents. By combined land it ranks #25 of 393 metropolitan areas, and #31 by population. It belongs to the Kansas City-Overland Park-Kansas City, MO-KS Combined Statistical Area.

ZIP codes

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

6404864062644296444464454644656447464477644906449264493

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 Clinton County

Clinton County shares a land border with 6 county equivalents. It has more land than 2 of them. The largest neighbor is Ray County (569 mi²) and the smallest is Clay County (397.7 mi²). Together with its neighbors, Clinton County forms a block of 3,061.4 mi² of land, of which it holds 13.7%.

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

Clinton County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 2.5 times as much. Missouri’s county land could hold about 164 areas the size of Clinton County.

Another way to picture it: the same land area would fill a square about 20.5 miles (32.9 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 Clinton County?

Clinton County has more land than 804 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 Clinton County at #2,474 nationally by total area, 56 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 1.1%, compared with a national county-equivalent median of 1.2%. The two percentages are within 0.1 percentage points of each other. 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 Clinton 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.