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County · code 19095

Iowa CountyIowa

Iowa County is a county in Iowa with its seat in Marengo, formed in 1843.

  • Founded1843
  • County seatMarengo
  • Named forIowa River, Iowa
  • Land area586 sq mi + 1 sq mi water
  • Population16,662 2020 Census
  • Parcels mapped19,618 checked 16 October 2026
Open the free map Click any parcel in Iowa County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

BentonPoweshiekJohnson Marengo Census outline · seat marked

Where it is

Iowa 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 CountyClarke 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 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 CountyIowa County Iowa
Counties of Iowa · Iowa highlighted

History

Formed in 1843 from Keokuk County and Poweshiek County

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

Iowa County was created by Iowa Territory from Keokuk County on February 17, 1843, with Poweshiek County initially attached for administrative purposes. The county was named after the Iowa River. Iowa County became fully organized on July 1, 1845, and became an official Iowa county when the state was created from Iowa Territory on December 28, 1846.

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

  1. 1843
    Iowa County created Iowa created by Iowa Territory from Keokuk; Poweshiek and Non-County Area 8 attached to Iowa "for judicial, revenue, and election purposes."
    from Keokukfrom Poweshiek
    · Iowa Terr. Rev. Stat. 1843, ch. 34, secs. 5-11/pp. 132-134
  2. 1844
    Changed Iowa attached to Johnson "for judicial, revenue, and election purposes"; Poweshiek and Non-County Area 8 remained attached to Iowa.
    JohnsonPoweshiek
    · Iowa Terr. Laws 1843-1844, ch. 4, secs. 1-2/p. 3
  3. 1844
    Changed Poweshiek and Non-County Area 8 detached from Iowa, attached to Mahaska "for election, revenue, and judicial purposes"; Iowa remained attached to Johnson.
    PoweshiekMahaskaJohnson
    · Iowa Terr. Laws 1843-1844, ch. 68, secs.1, 17-18/pp. 85-89
  4. 1845
    Changed Iowa fully organized, detached from Johnson.
    Johnson
    · Iowa Terr. Laws 1845, ch. 55, sec. 1/pp. 85-88
  5. 1846
    Became part of Iowa Iowa became an Iowa county when the state of Iowa was created from Iowa Territory. · U.S. Stat., vol. 9, ch. 1[1847]/p. 117

Land and parcels

What the maps cover in Iowa

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

Iowa by the Census

Population
16,662 2020 Census count
Housing units
7,341 2020 Census count
Land area
586 square miles
Water area
1 square miles
People per sq mi
28 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 Iowa 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 Iowa County

When was Iowa County founded?
Iowa County was founded in 1843, formed from Keokuk County and Poweshiek County, and named after Iowa River, Iowa.
What is the county seat of Iowa County?
The county seat of Iowa County is Marengo.
Is there an online parcel map for Iowa County?
Yes. A public source publishes a parcel map of 19,618 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Iowa County's boundary or name changed?
Iowa County was created in 1843 from Keokuk County and Poweshiek County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Johnson County, Poweshiek County and Mahaska County.
Is my lot in a flood zone?
We do not have flood maps for Iowa 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