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County · code 19039

Clarke CountyIowa

Clarke County is a county in Iowa with its seat in Osceola, formed in 1846.

  • Founded1846
  • County seatOsceola
  • Named forJames Clarke
  • Land area431 sq mi + 0.6 sq mi water
  • Population9,748 2020 Census
  • Parcels mapped12,054 checked 15 October 2026
Open the free map Click any parcel in Clarke County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

DecaturMadisonUnion Osceola Census outline · seat marked

Where it is

Clarke on the map of Iowa

Iowa has 99 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adair CountyAdams CountyAllamakee CountyAppanoose CountyAudubon CountyBenton CountyBlack Hawk CountyBoone CountyBremer CountyBuchanan CountyBuena Vista CountyButler CountyCalhoun CountyCarroll CountyCass CountyCedar CountyCerro Gordo CountyCherokee CountyChickasaw CountyClay CountyClayton CountyClinton CountyCrawford CountyDallas CountyDavis CountyDecatur CountyDelaware CountyDes Moines CountyDickinson CountyDubuque CountyEmmet CountyFayette CountyFloyd CountyFranklin CountyFremont CountyGreene CountyGrundy CountyGuthrie CountyHamilton CountyHancock CountyHardin CountyHarrison CountyHenry CountyHoward CountyHumboldt CountyIda CountyIowa CountyJackson CountyJasper CountyJefferson CountyJohnson CountyJones CountyKeokuk CountyKossuth CountyLee CountyLinn CountyLouisa CountyLucas CountyLyon CountyMadison CountyMahaska CountyMarion CountyMarshall CountyMills CountyMitchell CountyMonona CountyMonroe CountyMontgomery CountyMuscatine CountyO'Brien CountyOsceola CountyPage CountyPalo Alto CountyPlymouth CountyPocahontas CountyPolk CountyPottawattamie CountyPoweshiek CountyRinggold CountySac CountyScott CountyShelby CountySioux CountyStory CountyTama CountyTaylor CountyUnion CountyVan Buren CountyWapello CountyWarren CountyWashington CountyWayne CountyWebster CountyWinnebago CountyWinneshiek CountyWoodbury CountyWorth CountyWright CountyClarke County Clarke
Counties of Iowa · Clarke highlighted

History

Formed in 1846 from Kishkekosh County and Monroe County

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

Clarke County was created on January 13, 1846, by Iowa Territory from Kishkekosh (now Monroe) as an unorganized county. When Iowa became a state on December 28, 1846, Clarke County became an Iowa county. Clarke County was fully organized on August 21, 1851.

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

  1. 1846
    Clarke County created Clarke created by Iowa Territory from Non-County Area 4 attached to Kishkekosh (now Monroe); Clarke not fully organized, not attached.
    from Kishkekoshfrom Monroe
    · Iowa Terr. Laws 1845-1846, ch. 82, secs. 2, 11/pp. 73-75
  2. 1846
    Became part of Iowa Clarke became an Iowa county when the state of Iowa was created from Iowa Territory. · U.S. Stat., vol. 9, ch. 1[1847]/p. 117
  3. 1848
    Gained territory Clarke gained from Lucas, lost to Non-County Area 4 attached to Monroe.
    from Lucasfrom Monroe
    · Iowa Acts 1848-1849, ch. 9, secs. 1-2/pp. 332-333
  4. 1851
    Changed Clarke fully organized. · Swisher, "Organization of Counties," 574

Land and parcels

What the maps cover in Clarke

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

Clarke by the Census

Population
9,748 2020 Census count
Housing units
4,268 2020 Census count
Land area
431 square miles
Water area
0.6 square miles
People per sq mi
23 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 Clarke 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 Clarke County

When was Clarke County founded?
Clarke County was founded in 1846, formed from Kishkekosh County and Monroe County, and named after James Clarke.
What is the county seat of Clarke County?
The county seat of Clarke County is Osceola.
Is there an online parcel map for Clarke County?
Yes. Iowa Department of Homeland Security and Emergency Management (statewide parcels, mirrored by the University of Iowa) publishes a parcel map of 12,054 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Clarke County's boundary or name changed?
Clarke County was created in 1846 from Kishkekosh County and Monroe County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Lucas County and Monroe County.
Is my lot in a flood zone?
We do not have flood maps for Clarke 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