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County · code 29101

Johnson CountyMissouri

Johnson County is in Missouri and has its seat in Warrensburg. The county was formed on December 13, 1834.

  • Founded1834
  • County seatWarrensburg
  • Named forRichard Mentor Johnson
  • Land area829 sq mi + 3.9 sq mi water
  • Population54,013 2020 Census
  • Parcels mapped25,827 checked 16 October 2026
Open the free map Click any parcel in Johnson County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

LafayetteHenryPettisCassJackson Warrensburg Census outline · seat marked

Where it is

Johnson 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 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 CountyWarren CountyWashington CountyWayne CountyWebster CountyWorth CountyWright CountySt. Louis cityJohnson County Johnson
Counties of Missouri · Johnson highlighted

History

Formed in 1834 from Van Buren County, Cass County and Lafayette County

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

Johnson County was created from Van Buren (now Cass) and Lafayette. The county was named after Richard Mentor Johnson. In 1847, Johnson lost territory to the creation of Donaldson, an extinct county, though Donaldson was not fully organized and its unorganized part was attached to Johnson for all civil and military purposes. In 1849, the creation of Donaldson was repealed and Johnson regained the part of Donaldson it had previously held.

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

  1. 1834
    Johnson County created Johnson created from Van Buren (now Cass) and Lafayette.
    from Van Burenfrom Cassfrom Lafayette
    · Mo. Laws 1834-1835, priv. and loc., pp. 37-38
  2. 1847
    Lost territory Johnson lost to creation of Donaldson (extinct); Donaldson not fully organized, part attached to Johnson "for all civil and military purposes."
    to Donaldson
    · Mo. Laws 1846-1847, pub., p. 17
  3. 1849
    Changed Creation of Donaldson (extinct) repealed; Johnson regained part of Donaldson (extinct) that it previously held.
    Donaldson
    · Mo. Laws 1848-1849, pub., p. 32

Land and parcels

What the maps cover in Johnson

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

Johnson by the Census

Population
54,013 2020 Census count
Housing units
22,601 2020 Census count
Land area
829 square miles
Water area
3.9 square miles
People per sq mi
65 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

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Zoning and code

County government

See your own lot on these maps

Open Johnson 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 Johnson County

When was Johnson County founded?
Johnson County was founded in 1834, formed from Van Buren County, Cass County and Lafayette County, and named after Richard Mentor Johnson.
What is the county seat of Johnson County?
The county seat of Johnson County is Warrensburg.
Is there an online parcel map for Johnson County?
Yes. Johnson County publishes a parcel map of 25,827 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Johnson County's boundary or name changed?
Johnson County was created in 1834 from Van Buren County, Cass County and Lafayette County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Donaldson County.
Is my lot in a flood zone?
We do not have flood maps for Johnson 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