Oregon County, Missouri

Oregon County: County in Missouri, United States


Oregon County is a county located in the U.S. state of Missouri. As of the 2010 census, the population was 10,881 and a population density of 5 people per km². After 10 years in 2020 county had an estimated population of 10,411 inhabitants. Its county seat is Alton. The county was created 178 years ago in 1844.

Quick Facts about Oregon County

Population : 10,411 (2020)
Country : United States of America
State : Missouri (United States)
Area : 2050 km2
Water as percent of area : 0.2%
Land as percent of area : 99.8%
Named for : Oregon Territory
Altitude : 902 feet / 275 meters
Capital : Alton
Establishment : January 01, 1845
Time Zone : America/Chicago
Local time : 22:14:43 (7th February 2023)
Density : 5 Pop. per km² as of 2020
Population growth : -4.51% (2010-2020)
Oregon County locator map
Location of Oregon County on Missouri map.
Oregon County MO Courthouse 20151021-020 image
Oregon County MO Courthouse 20151021-020
Oregon County MO Courthouse 20151021-020 image


Oregon County is located at 36°41'12"N 91°24'12"W (36.6867200, -91.4032900). It has 2 neighbors: Carter County and Shannon County.

Oregon County map

The largest city of Oregon County is Thayer with a population of 2,103. Other cities include, Alton population 823 and Koshkonong population 199. See all Oregon County cities & populated places.

Oregon County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Oregon County.

City Name Population Title
Thayer 2,103 City
Alton 823 City in Missouri
Koshkonong 199 City in Missouri, United States

Oregon County has 2 neighbours.

  • Alton


According to census records, the population of Oregon County decreased by 4.51% in 10 years.

Year Population % Change Method
2010 10,881 - census
2011 11,044 1.48% estimation process
2012 10,966 -0.71% estimation process
2013 10,927 -0.36% estimation process
2014 10,823 -0.96% estimation process
2015 10,850 0.25% estimation process
2016 10,746 -0.97% estimation process
2017 10,553 -1.83% estimation process
2018 10,558 0.05% estimation process
2019 10,529 -0.28% estimation process
2020 10,411 -1.13% estimation process

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People born in Oregon County (2)

People born in Oregon County, including businessman and baseball team owner David Glass, United States federal judge Russell Gentry Clark, .


Missouri Other Counties (more counties)

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Kansas City 495,327 Largest municipality in the U.
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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