Saint Clair County , Missouri

Saint Clair County: County in Missouri, United States

Saint Clair County locator map
Location of Saint Clair County on Missouri map.


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 9 years in 2019 county had an estimated population of 9,397 inhabitants. Its county seat is Osceola. The county was created 180 years ago in 1840.


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.

Weaubleau Structure shaded relief image
Weaubleau Structure shaded relief

The largest city of Saint Clair County is Appleton City with a population of 1,080. Other cities include, Osceola population 908, Lowry City population 613, Collins population 152 and Roscoe population 117. See all Saint Clair County cities & populated places.

Saint Clair County map

Saint Clair County Quick Facts

Population : 9,397 (2019)
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 : 00:58:09 (13th June 2021)
Density : 5 Pop. per km² as of 2019
Population growth : -4.34% (2010-2019)

Saint Clair County has 7 neighbours.

  • Osceola


According to census records, the population of Saint Clair County decreased by 4.34% in 9 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

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

Other places with the same name (3)

  • 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.
  • Saint Clair County, Michigan county in Alabama, United States
  • Saint Clair County, Alabama county in Alabama, United States

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 908 City in St.
Lowry City 613 City in Saint Clair County, Missouri, United States
Collins 152 Human settlement in St.
Roscoe 117 Human settlement in St.
Vista 46 Human settlement in St.
Gerster 24 Village in the United States

Missouri Other Counties (more counties)

County Name Population Title
Missouri 6,137,428 State of the United States of America
Saint Louis County 994,205 County in Minnesota, United States
Jackson County 703,011 County in Oregon, United States
Kansas City 495,327 Largest municipality in the U.
Saint Charles County 402,022 County in Missouri, United States
St. Louis 315,685 City in Missouri, United States
Greene County 293,086 County in Tennessee, United States
Clay County 249,948 County in North Carolina, United States
Jefferson County 225,081 County in Missouri, United States
Boone County 180,463 County in West Virginia, United States
Columbia 123,195 City in Missouri, United States
Jasper County 121,328 County in South Carolina, United States
Cass County 105,780 County in Missouri, United States
Platte County 104,418 County in Wyoming, United States
Franklin County 103,967 County in Missouri, United States
Lee's Summit 99,357 City in Missouri, United States
Weaubleau Structure shaded relief image

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