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County · code 29149

Oregon CountyMissouri

Oregon County is a county in Missouri with its seat in Alton, formed in 1841.

  • Founded1841
  • County seatAlton
  • Named forOregon Territory
  • Land area790 sq mi + 1.8 sq mi water
  • Population8,635 2020 Census
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Updated

ShannonHowellRandolph, ARFulton, ARSharp, ARRipley Alton Census outline · seat marked

Where it is

Oregon on the map of Missouri

Missouri has 115 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adair CountyAndrew CountyAtchison CountyAudrain CountyBarry CountyBarton CountyBates CountyBenton CountyBollinger CountyBoone CountyBuchanan CountyButler CountyCaldwell CountyCallaway CountyCamden CountyCape Girardeau CountyCarroll CountyCarter CountyCass CountyCedar CountyChariton CountyChristian CountyClark CountyClay CountyClinton CountyCole CountyCooper CountyCrawford CountyDade CountyDallas CountyDaviess CountyDeKalb CountyDent CountyDouglas CountyDunklin CountyFranklin CountyGasconade CountyGentry CountyGreene CountyGrundy CountyHarrison CountyHenry CountyHickory CountyHolt CountyHoward CountyHowell CountyIron CountyJackson CountyJasper CountyJefferson CountyJohnson CountyKnox CountyLaclede CountyLafayette CountyLawrence CountyLewis CountyLincoln CountyLinn CountyLivingston CountyMcDonald CountyMacon CountyMadison CountyMaries CountyMarion CountyMercer CountyMiller CountyMississippi CountyMoniteau CountyMonroe CountyMontgomery CountyMorgan CountyNew Madrid CountyNewton CountyNodaway CountyOsage CountyOzark CountyPemiscot CountyPerry CountyPettis CountyPhelps CountyPike CountyPlatte CountyPolk CountyPulaski CountyPutnam CountyRalls CountyRandolph CountyRay CountyReynolds CountyRipley CountySt. Charles CountySt. Clair CountySte. Genevieve CountySt. Francois CountySt. Louis CountySaline CountySchuyler CountyScotland CountyScott CountyShannon CountyShelby CountyStoddard CountyStone CountySullivan CountyTaney CountyTexas CountyVernon CountyWarren CountyWashington CountyWayne CountyWebster CountyWorth CountyWright CountySt. Louis cityOregon County Oregon
Counties of Missouri · Oregon highlighted

History

Formed in 1841 from Ripley County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Oregon County was created from Ripley County on February 15, 1841, but remained unorganized and attached to Ripley for civil and military purposes until 1845. The county was named after Oregon Territory. Oregon County lost territory to the creation of Howell County in 1857 and to Shannon County in 1859, and exchanged territory with Ripley County in 1868.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1841
    Oregon County created Oregon created from Ripley; Oregon not fully organized, attached to Ripley "for all civil and military purposes."
    from Ripley
    · Mo. Laws 1840-1841, pub., p. 43
  2. 1845
    Changed Oregon fully organized, detached from Ripley.
    Ripley
    · Mo. Laws 1844-1845, secs. 35-37/p. 35
  3. 1857
    Lost territory Oregon lost to creation of Howell.
    to Howell
    · Mo. Laws 1856-1857, gen., pp. 51-52
  4. 1859
    Lost territory Oregon lost to Shannon.
    to Shannon
    · Mo. Laws 1858-1859, p. 413
  5. 1868
    Exchanged territory Oregon exchanged with Ripley.
    with Ripley
    · Mo. Laws 1868, adj. sess., gen., pp. 16-23

Land and parcels

What the maps cover in Oregon

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Oregon by the Census

Population
8,635 2020 Census count
Housing units
4,316 2020 Census count
Land area
790 square miles
Water area
1.8 square miles
People per sq mi
11 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

See your own lot on these maps

Open Oregon County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

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Questions

Common questions about Oregon County

When was Oregon County founded?
Oregon County was founded in 1841, formed from Ripley County, and named after Oregon Territory.
What is the county seat of Oregon County?
The county seat of Oregon County is Alton.
Is there an online parcel map for Oregon County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Oregon County's boundary or name changed?
Oregon County was created in 1841 from Ripley County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Ripley County, Howell County and Shannon County.
Is my lot in a flood zone?
We do not have flood maps for Oregon County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door