Saint Louis County, Missouri

Saint Louis County: County in Minnesota, United States


Saint Louis County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 998,954 and a population density of 56 people per km². After 10 years in 2020 county had an estimated population of 994,020 inhabitants. Its county seat is Duluth. The county was created 168 years ago in 1856.

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

Quick Facts about Saint Louis County

Population : 994,020 (2020)
Country : United States of America
State : Missouri (United States)
Different from : St. Louis, St. Louis County
Area : 17767 km2
Water as percent of area : 8.9%
Land as percent of area : 91.1%
Named for : Saint Louis River
Altitude : 541 feet / 165 meters
Capital : Duluth
Establishment : March 03, 1856
Time Zone : America/Chicago
Local time : 01:59:51 (2nd March 2024)
Density : 56 Pop. per km² as of 2020
Population growth : -0.5% (2010-2020)
SLCCH image
SLCCH image


Saint Louis County is located at 38°38'26"N 90°26'36"W (38.6406800, -90.4434100). It has 4 neighbors: Aitkin County, Carlton County, Koochiching County and Lake County.

Saint Louis County map

The largest city of Saint Louis County is Castle Point with a population of 90,070. Other cities include, Florissant population 50,795, Chesterfield population 47,570, Oakville population 36,143 and Wildwood population 35,460. See all Saint Louis County cities & populated places.

Saint Louis County Populated Places (more)

Cities, towns, neighborhoods & other populated places in Saint Louis County.

City Name Population Title
Castle Point 90,070 A census-designated place in Jefferson County, Missouri.
Florissant 50,795 The most populous city in St.
Chesterfield 47,570 A city in St.
Oakville 36,143 City in Halton Region, Ontario
Wildwood 35,460 City in New Jersey
University City 34,165 Suburb in St.
Ballwin 30,094 City in Saint Louis County, Missouri, United States
Mehlville 28,380 Census designated place
Kirkwood 27,866 Suburb of St.
Maryland Heights 26,895 City in Missouri, United States
Hazelwood 25,042 Suburb city of St.
Webster Groves 22,896 City in Missouri
Ferguson 20,457 Town in St.
Affton 20,307 Census designated place
Spanish Lake 19,650 Census designated place
Creve Coeur 18,624 City in St.

Saint Louis County has 4 neighbours.


According to census records, the population of Saint Louis County decreased by 0.5% in 10 years.

Year Population % Change Method
2010 998,954 - census
2011 1,000,040 0.11% estimation process
2012 1,000,761 0.07% estimation process
2013 1,000,456 -0.03% estimation process
2014 1,000,528 0.01% estimation process
2015 1,001,109 0.06% estimation process
2016 997,837 -0.33% estimation process
2017 996,227 -0.16% estimation process
2018 995,219 -0.1% estimation process
2019 994,205 -0.1% estimation process
2020 994,020 -0.02% estimation process

Comte de Saint Louis, Comté de Saint Louis, Saint Louis

People born in Saint Louis County (4)

People born in Saint Louis County, including former US senior policy advisor, convicted fraudster John C. Beale, mathematician Vernon Bakke, politician Robert O. Ashbach, .


Other places with the same name (2)

Missouri Other Counties (more counties)

County Name Population Title
Jackson County 705,925 County in Oregon, United States
Kansas City 495,327 The third most populous city in Missouri and the center of the Kansas City metropolitan area.
Saint Charles County 406,204 County in Missouri, United States
St. Louis 315,685 The second most populous city in Missouri and the center of the St.
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 The most populous city in the state of Missouri.
Jasper County 121,648 County in South Carolina, United States
Independence 116,774 A city in Jackson County, Missouri.
East Independence 110,675 A census-designated place in Jackson County, Missouri.
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
Lee's Summit 101,467 The most populous city in Jackson County, Missouri.