Saint Clair County, Missouri

Saint Clair County: County in Missouri, United States


Saint Clair County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 9,805 and a population density of 5 people per km². After 10 years in 2020 county had an estimated population of 9,689 inhabitants. Its county seat is Osceola. The county was created 182 years ago in 1840.

Quick Facts about Saint Clair County

Population : 9,689 (2020)
Country : United States of America
State : Missouri (United States)
Different from : St. Clair County, St. Clair County, St. Clair County
Area : 1818 km2
Water as percent of area : 4.6%
Land as percent of area : 95.4%
Named for : Arthur St. Clair
Capital : Osceola
Establishment : January 01, 1841
Time Zone : America/Chicago
Local time : 08:10:49 (1st June 2023)
Density : 5 Pop. per km² as of 2020
Population growth : -1.2% (2010-2020)
Saint Clair County locator map
Location of Saint Clair County on Missouri map.
Weaubleau Structure shaded relief image
Weaubleau Structure shaded relief
Weaubleau Structure shaded relief image


Saint Clair County is located at 38°2'14"N 93°46'34"W (38.0371800, -93.7759800). It has 7 neighbors: Bates County, Benton County, Cedar County, Henry County, Hickory County, Polk and Vernon County.

Saint Clair County map

The largest city of Saint Clair County is Appleton City with a population of 1,080. Other cities include, Osceola population 935, Lowry City population 613, Collins population 159 and Roscoe population 121. See all Saint Clair County cities & populated places.

Saint Clair County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Saint Clair County.

City Name Population Title
Appleton City 1,080 City in St.
Osceola 935 City in St.
Lowry City 613 City in Saint Clair County, Missouri, United States
Collins 159 Human settlement in St.
Roscoe 121 Human settlement in St.
Vista 47 Human settlement in St.
Gerster 24 Village in the United States

Saint Clair County has 7 neighbours.

  • Osceola


According to census records, the population of Saint Clair County decreased by 1.2% in 10 years.

Year Population % Change Method
2010 9,805 - census
2011 9,693 -1.16% estimation process
2012 9,527 -1.74% estimation process
2013 9,487 -0.42% estimation process
2014 9,432 -0.58% estimation process
2015 9,411 -0.22% estimation process
2016 9,288 -1.32% estimation process
2017 9,365 0.82% estimation process
2018 9,389 0.26% estimation process
2019 9,397 0.09% estimation process
2020 9,689 3.01% estimation process

Comte de Saint Clair, Comté de Saint Clair, Saint Clair, Saint Clair County

Other places with the same name (4)

  • Saint Clair County , Illinois The County of St. Clair is the oldest county in the U. S. Illinois state; the Mississippi River, bordering the U, forms its western boundary. S. Missouri State. In southern Illinois, it is part of the Metro East. It had a population of 270,056 according to the 2010 United States Census, making it the eighth-most populous county in Illinois and the most populous in the state's southern part. Its seat in the county is Belleville. with a population of 258,046 people.
  • Saint Clair County , Michigan county in Alabama, United States with a population of 159,293 people.
  • Saint Clair County , Alabama county in Alabama, United States with a population of 90,739 people.

Missouri Other Counties (more counties)

County Name Population Title
Saint Louis County 994,020 County in Minnesota, United States
Jackson County 705,925 County in Oregon, United States
Kansas City 495,327 Largest municipality in the U.
Saint Charles County 406,204 County in Missouri, United States
St. Louis 315,685 City in Missouri, United States
Greene County 294,997 County in Tennessee, United States
Clay County 253,463 County in North Carolina, United States
Jefferson County 226,543 County in Missouri, United States
Boone County 182,991 County in West Virginia, United States
Columbia 124,769 City in Missouri, United States
Jasper County 121,648 County in South Carolina, United States
Independence 116,774 County seat of Jackson County, Missouri, United States
East Independence 110,675 City in Jackson County, Missouri, United States of America
Cass County 106,806 County in Missouri, United States
Platte County 106,532 County in Wyoming, United States
Franklin County 104,469 County in Missouri, United States