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County · code 20091

Johnson CountyKansas

Johnson County is a county in Kansas, named after Thomas Johnson. The county seat is Olathe.

  • Founded1855
  • County seatOlathe
  • Named forThomas Johnson
  • Land area474 sq mi + 6.3 sq mi water
  • Population609,863 2020 Census
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Updated

WyandotteMiamiLeavenworthDouglasJackson, MOCass, MOFranklin Olathe Census outline · seat marked

Where it is

Johnson on the map of Kansas

Kansas has 105 counties and county equivalents, each with its own records office. Shapes with a page are links.

Allen CountyAnderson CountyAtchison CountyBarber CountyBarton CountyBourbon CountyBrown CountyButler CountyChase CountyChautauqua CountyCherokee CountyCheyenne CountyClark CountyClay CountyCloud CountyCoffey CountyComanche CountyCowley CountyCrawford CountyDecatur CountyDickinson CountyDoniphan CountyDouglas CountyEdwards CountyElk CountyEllis CountyEllsworth CountyFinney CountyFord CountyFranklin CountyGeary CountyGove CountyGraham CountyGrant CountyGray CountyGreeley CountyGreenwood CountyHamilton CountyHarper CountyHarvey CountyHaskell CountyHodgeman CountyJackson CountyJefferson CountyJewell CountyKearny CountyKingman CountyKiowa CountyLabette CountyLane CountyLeavenworth CountyLincoln CountyLinn CountyLogan CountyLyon CountyMcPherson CountyMarion CountyMarshall CountyMeade CountyMiami CountyMitchell CountyMontgomery CountyMorris CountyMorton CountyNemaha CountyNeosho CountyNess CountyNorton CountyOsage CountyOsborne CountyOttawa CountyPawnee CountyPhillips CountyPottawatomie CountyPratt CountyRawlins CountyReno CountyRepublic CountyRice CountyRiley CountyRooks CountyRush CountyRussell CountySaline CountyScott CountySedgwick CountySeward CountyShawnee CountySheridan CountySherman CountySmith CountyStafford CountyStanton CountyStevens CountySumner CountyThomas CountyTrego CountyWabaunsee CountyWallace CountyWashington CountyWichita CountyWilson CountyWoodson CountyWyandotte CountyJohnson County Johnson
Counties of Kansas · Johnson highlighted

History

Founded in 1855

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

Johnson County was created by Kansas Territory on August 25, 1855. On January 29, 1859, part of the county was lost to the creation of Wyandotte County. Johnson County became a county in the state of Kansas on January 29, 1861.

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

  1. 1855
    Johnson County created Johnson created by Kansas Territory from non-county area. · Kans. Terr. Laws 1855, 1st leg., ch. 30, sec. 1/p. 205
  2. 1857
    Boundary clarified Johnson boundaries redefined to run on federal land survey lines (no change).
    no change
    · Kans. Terr. Laws 1857, 2d leg., sec. 1/pp. 37-38
  3. 1859
    Lost territory Johnson lost to creation of Wyandotte.
    to Wyandotte
    · Kans. Terr. Laws 1859, 5th leg., ch. 47/pp. 362-364
  4. 1861
    Became part of Kansas Johnson became a county in the state of Kansas. · U.S. Stat., vol. 12, ch. 20 [1861]/pp. 126-128; Van Zandt, 138-139

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
609,863 2020 Census count
Housing units
251,681 2020 Census count
Land area
474 square miles
Water area
6.3 square miles
People per sq mi
1,288 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

Johnson 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 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 1855, and named after Thomas Johnson.
What is the county seat of Johnson County?
The county seat of Johnson County is Olathe.
Is there an online parcel map for Johnson 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 Johnson County's boundary or name changed?
Johnson County was created in 1855. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Wyandotte 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