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County · code 19029

Cass CountyIowa

Cass County is a county in Iowa with its seat in Atlantic, formed on January 15, 1851.

  • Founded1851
  • County seatAtlantic
  • Named forLewis Cass
  • Land area564 sq mi + 0.7 sq mi water
  • Population13,127 2020 Census
  • Parcels mapped17,160 checked 15 October 2026
Open the free map Click any parcel in Cass County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

AdairPottawattamie Atlantic Census outline · seat marked

Where it is

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

History

Formed in 1851 from Pottawattamie County

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

Cass County was created from Pottawattamie County on January 15, 1851, and named after Lewis Cass. When fully organized in 1853, Adair and Audubon counties were attached to Cass for administrative purposes, but both were detached and fully organized by 1855.

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

  1. 1851
    Cass County created Cass created from Pottawattamie; Cass not fully organized, not attached.
    from Pottawattamie
    · Iowa Acts 1850-1851, ch. 9, sec. 4/p. 28
  2. 1853
    Changed Cass fully organized; Adair and Audubon attached to Cass "for revenue, election, and judicial purposes".
    AdairAudubon
    · Iowa Acts 1852-1853, ch. 8, secs. 8, 10/p. 23
  3. 1854
    Changed Adair fully organized, detached from Cass.
    Adair
    · Swisher, "Organization of Counties," 574
  4. 1855
    Changed Audubon fully organized, detached from Cass.
    Audubon
    · Swisher, "Organization of Counties," 574

Land and parcels

What the maps cover in Cass

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

Cass by the Census

Population
13,127 2020 Census count
Housing units
6,398 2020 Census count
Land area
564 square miles
Water area
0.7 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

Cass 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 Cass 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 Cass County

When was Cass County founded?
Cass County was founded in 1851, formed from Pottawattamie County, and named after Lewis Cass.
What is the county seat of Cass County?
The county seat of Cass County is Atlantic.
Is there an online parcel map for Cass County?
Yes. A public source publishes a parcel map of 17,160 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Cass County's boundary or name changed?
Cass County was created in 1851 from Pottawattamie County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Adair County and Audubon County.
Is my lot in a flood zone?
We do not have flood maps for Cass 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