Clinton County is county located in the U.S. state of Missouri and is part of the Kansas City metropolitan area. As of the 2020 U.S. Census, the county had a population of 21,184. Its county seat is Plattsburg. The county was organized January 2, 1833, and named for Governor DeWitt Clinton of New York. The county seat of Plattsburg derives its name from a town of a similar name that is the county seat of Clinton County, New York, which was also named for the Governor.

Geography

According to the U.S. Census Bureau, the county has a total area of 423 sqmi, of which 419 sqmi is land and 4.5 sqmi (1.1%) is water.

Adjacent counties

Major highways

Demographics

As of the census of 2017, there were 20,554 people, 8,990 households, and 8,299 families residing in the county. The population density was 49.5 /mi2. There were 7,877 housing units at an average density of 19 /mi2. The racial makeup of the county was 95.5% White, 1.4% Black or African American, 0.7% Native American, 0.4% Asian, 0.01% Pacific Islander, 0.27% from other races, and 1.9% from two or more races. Approximately 2.1% of the population were Hispanic or Latino of any race. There were 7,152 households, out of which 34.90% had children under the age of 18 living with them, 61.40% were married couples living together, 8.80% had a female householder with no husband present, and 25.90% were non-families. 22.00% of all households were made up of individuals, and 10.50% had someone living alone who was 65 years of age or older. The average household size was 2.59 and the average family size was 3.03. In the county, the population was spread out, with 26.80% under the age of 18, 7.40% from 18 to 24, 28.20% from 25 to 44, 23.50% from 45 to 64, and 14.10% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 96.00 males. For every 100 females age 18 and over, there were 91.60 males. The median income for a household in the county was $57,486, and the median income for a family was $48,244. Males had a median income of $36,307 versus $22,991 for females. The per capita income for the county was $19,056. About 7.30% of families and 9.30% of the population were below the poverty line, including 11.30% of those under age 18 and 12.70% of those age 65 or over.

2020 Census

Education

Public schools

Public libraries

Communities

Cities

Village

Census-designated places

Other unincorporated places

Politics

Local

The Republican Party predominantly controls politics at the local level in Clinton County. Republicans hold all but one of the elected positions in the county.

State

Clinton County is split into two Missouri House of Representatives District numbers 8 & 9. This change occurred after the mandatory redistricting caused by the 2020 census. All of Clinton County is a part of Missouri's 12th District in the Missouri Senate and is currently represented by Rusty Black (R-Chillicothe, MO).

Federal

All of Clinton County is included in Missouri's 6th Congressional District and is currently represented by Sam Graves (R-Tarkio) in the U.S. House of Representatives.