County Maps US

Oregon County, Missouri

A county in Missouri, ranked 94 of 115 by population.

CountyFIPS 29149

Within Missouri
Oregon County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Alton, the county seat, located via the 2025 Census Gazetteer.

Download SVGFull Missouri map downloads

Population
8,709
+104 (+1.2%) since 2020
Land area
789.8
square miles. A further 0.2% of the total area is water
Population density
11.0
people per square mile, computed rather than published
County seat
Alton
Seat of county government.
Established
1845
180 years ago
Largest city
Thayer city
Population 1,898.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Oregon County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Oregon County, Missouri from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 706 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Oregon County ranks

Position among the 115 counties of Missouri, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MissouriNationally
Population8,70994th of 1152,514th of 3,144
Land area789.8 sq mi14th of 1151,091st of 3,144
Population density11.0 per sq mi103rd of 1152,531st of 3,144
Median household income$43,069112th of 1153,006th of 3,143

Full data for Oregon County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population8,709Vintage 2025 Population Estimates
Population in 20208,605Vintage 2025 Population Estimates
2020 estimates base?8,634Vintage 2025 Population Estimates
Land area789.8 sq mi2025 Gazetteer Files
Water area1.7 sq mi2025 Gazetteer Files
Total area791.6 sq mi2025 Gazetteer Files
Population density?11.0 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$43,069American Community Survey 2020-2024 5-Year Estimates
Median home value$113,300American Community Survey 2020-2024 5-Year Estimates
Median age44.5American Community Survey 2020-2024 5-Year Estimates
Households3,380American Community Survey 2020-2024 5-Year Estimates
Housing units4,321American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-85
113 births, 198 deaths
Net migration
+131
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 7 areas bordering Oregon County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Howell CountyMissouri28 mi40,798
Shannon CountyMissouri24 mi7,285
Ripley CountyMissouri23 mi10,717
Randolph CountyArkansas16 mi18,876
Fulton CountyArkansas12 mi12,492
Carter CountyMissouri10 mi5,418
Sharp CountyArkansas2.4 mi18,122

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 115 counties of Missouri

Open the interactive Missouri county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.