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County · code 19157

Poweshiek CountyIowa

Poweshiek County is a county in Iowa, with its seat in Montezuma. It was created by Iowa Territory in 1843 and became a county of the state of Iowa in 1846.

  • Founded1843
  • County seatMontezuma
  • Named forPoweshiek
  • Land area585 sq mi + 1.1 sq mi water
  • Population18,662 2020 Census
  • Parcels mapped20,613 checked 15 October 2026
Open the free map Click any parcel in Poweshiek County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

TamaIowaJasper Montezuma Census outline · seat marked

Where it is

Poweshiek 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 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 CountyRinggold CountySac CountyScott CountyShelby CountySioux CountyStory CountyTama CountyTaylor CountyUnion CountyVan Buren CountyWapello CountyWarren CountyWashington CountyWayne CountyWebster CountyWinnebago CountyWinneshiek CountyWoodbury CountyWorth CountyWright CountyPoweshiek County Poweshiek
Counties of Iowa · Poweshiek highlighted

History

Formed in 1843 from Keokuk County and Iowa County

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

Poweshiek County was created by Iowa Territory from Keokuk County on February 17, 1843, but was not immediately organized and was attached to Iowa County for judicial, revenue, and election purposes. It was then attached to Mahaska County for similar purposes until March 1, 1844, when it was detached from Iowa County. When Iowa became a state on December 28, 1846, Poweshiek County became a county of the state, and it was fully organized and detached from Mahaska County on April 3, 1848.

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

  1. 1843
    Poweshiek County created Poweshiek created by Iowa Territory from Keokuk; Poweshiek not fully organized, attached to Iowa "for judicial, revenue, and election purposes."
    from Keokukfrom Iowa
    · Iowa Terr. Rev. Stat. 1843, ch. 34, sec. 8/p. 133
  2. 1844
    Changed Poweshiek and Non-County Area 8 indirectly attached to Johnson, through Iowa, until 1 March 1844.
    JohnsonIowa
    · Iowa Terr. Laws 1843-1844, ch. 4, secs. 1-2/p. 3
  3. 1844
    Changed Poweshiek detached from Iowa, attached to Mahaska "for election, revenue, and judicial purposes."
    IowaMahaska
    · Iowa Terr. Laws 1843-1844, ch. 68, secs.1, 17-18/pp. 85-89
  4. 1846
    Became part of Iowa Poweshiek became an Iowa county when the state of Iowa was created from Iowa Territory. · U.S. Stat., vol. 9, ch. 1[1847]/p. 117
  5. 1848
    Changed Poweshiek fully organized, detached from Mahaska.
    Mahaska
    · Iowa Acts 1848, ext. sess., ch. 54, sec. 1/pp. 55-57

Land and parcels

What the maps cover in Poweshiek

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

Poweshiek by the Census

Population
18,662 2020 Census count
Housing units
8,906 2020 Census count
Land area
585 square miles
Water area
1.1 square miles
People per sq mi
32 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

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Questions

Common questions about Poweshiek County

When was Poweshiek County founded?
Poweshiek County was founded in 1843, formed from Keokuk County and Iowa County, and named after Poweshiek.
What is the county seat of Poweshiek County?
The county seat of Poweshiek County is Montezuma.
Is there an online parcel map for Poweshiek County?
Yes. Iowa Department of Homeland Security and Emergency Management (statewide parcels, mirrored by the University of Iowa) publishes a parcel map of 20,613 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Poweshiek County's boundary or name changed?
Poweshiek County was created in 1843 from Keokuk County and Iowa County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Iowa County, Mahaska County and Johnson County.
Is my lot in a flood zone?
We do not have flood maps for Poweshiek 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