Marion County, Missouri

Marion County: County in northeast Missouri, United States


Marion County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 28,781 and a population density of 25 people per km². After 10 years in 2020 county had an estimated population of 28,423 inhabitants. Its county seat is Palmyra. The county was created 198 years ago in 1825.

Marion County locator map
Location of Marion County on Missouri map.

Quick Facts about Marion County

Population : 28,423 (2020)
Country : United States of America
State : Missouri (United States)
Different from : Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County, Marion County
Area : 1150 km2
Water as percent of area : 1.7%
Land as percent of area : 98.3%
Named for : Francis Marion
Capital : Palmyra
Capital city : Marion County is capital of Taylor
Establishment : January 01, 1826
Time Zone : America/Chicago
Local time : 00:23:44 (15th June 2024)
Density : 25 Pop. per km² as of 2020
Population growth : -1.26% (2010-2020)
Marion County MO courthouse Palmyra-001 image
Marion County MO courthouse Palmyra-001
Marion County MO courthouse Palmyra-001 image


Marion County is located at 39°48'21"N 91°37'20"W (39.8059600, -91.6223500). It has 6 neighbors: Adams County, Pike County, Monroe County, Ralls County, Shelby County and Lewis County.

Marion County map

The largest city of Marion County is Hannibal with a population of 17,246. Other cities include, Palmyra population 3,578 and Taylor population 166. See all Marion County cities & populated places.

Marion County Populated Places

Cities, towns, neighborhoods & other populated places in Marion County.

City Name Population Title
Hannibal 17,246 City in Missouri, USA
Palmyra 3,578 City in Marion County, Missouri, United States of America
Taylor 166 Unincorporated community in Missouri, United States

Marion County has 6 neighbours.

  • Palmyra


According to census records, the population of Marion County decreased by 1.26% in 10 years.

Year Population % Change Method
2010 28,781 - census
2011 28,786 0.02% estimation process
2012 28,746 -0.14% estimation process
2013 28,769 0.08% estimation process
2014 28,766 -0.01% estimation process
2015 28,697 -0.24% estimation process
2016 28,689 -0.03% estimation process
2017 28,585 -0.36% estimation process
2018 28,540 -0.16% estimation process
2019 28,530 -0.04% estimation process
2020 28,423 -0.38% estimation process

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People born in Marion County (3)

People born in Marion County, including actress Jane Darwell, balloonist Thomas Scott Baldwin, centenarian and United States Army soldier Harry Richard Landis, .


Other places with the same name (17)

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 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