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County · code 29219

Warren CountyMissouri

Warren County is a county in Missouri with its seat in Warrenton. It was formed on January 5, 1833.

  • Founded1833
  • County seatWarrenton
  • Named forJoseph Warren
  • Land area429 sq mi + 9.2 sq mi water
  • Population35,532 2020 Census
  • Parcels mapped26,028 checked 15 October 2026
Open the free map Click any parcel in Warren County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

LincolnMontgomeryFranklinGasconadeSt. Charles Warrenton Census outline · seat marked

Where it is

Warren 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 CountyOregon 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 CountyWashington CountyWayne CountyWebster CountyWorth CountyWright CountySt. Louis cityWarren County Warren
Counties of Missouri · Warren highlighted

History

Formed in 1833 from Montgomery County

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

Warren County was created from Montgomery County and named after Joseph Warren. In 1843, it exchanged boundary areas with Lincoln County on two occasions.

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

  1. 1833
    Warren County created Warren created from Montgomery.
    from Montgomery
    · Mo. Laws 1832-1833, pub., ch. 95, sec. 1/pp. 126-128
  2. 1843
    Exchanged territory Warren exchanged with Lincoln.
    with Lincoln
    · Mo. Laws 1842-1843, pub., pp. 30-40
  3. 1843
    Exchanged territory Warren exchanged with Lincoln.
    with Lincoln
    · Mo. Laws 1842-1843, pub., pp. 40-41

Land and parcels

What the maps cover in Warren

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

Warren by the Census

Population
35,532 2020 Census count
Housing units
15,355 2020 Census count
Land area
429 square miles
Water area
9.2 square miles
People per sq mi
83 population ÷ land area

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

Rules and offices

Warren County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Warren 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 Warren County

When was Warren County founded?
Warren County was founded in 1833, formed from Montgomery County, and named after Joseph Warren.
What is the county seat of Warren County?
The county seat of Warren County is Warrenton.
Is there an online parcel map for Warren County?
Yes. Warren County publishes a parcel map of 26,028 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Warren County's boundary or name changed?
Warren County was created in 1833 from Montgomery County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Lincoln County.
Is my lot in a flood zone?
We do not have flood maps for Warren 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