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County · code 19025

Calhoun CountyIowa

Calhoun County is a county in Iowa, with its seat in Rockwell City. The county was created on January 15, 1851, from Polk County and named after John C. Calhoun.

  • Founded1851
  • County seatRockwell City
  • Named forJohn C. Calhoun
  • Land area570 sq mi + 2.3 sq mi water
  • Population9,927 2020 Census
  • Parcels mapped17,722 checked 15 October 2026
Open the free map Click any parcel in Calhoun County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

PocahontasWebsterSac Rockwell City Census outline · seat marked

Where it is

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

History

Formed in 1851 from Polk County

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

Originally created as Fox County in 1851, it was renamed Calhoun County in 1853 and attached to Boone County for administration and judicial purposes. In 1855, Calhoun County was detached from Boone County and attached to Greene County for elections and revenue, then became fully organized and independent later that year.

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

  1. 1851
    Calhoun County created Fox (now Calhoun) created from Non-County Area 9 attached to Polk; Fox not fully organized, not attached.
    from Polk
    · Iowa Acts 1850-1851, ch. 9, sec. 20/p. 32
  2. 1853
    Renamed Fox renamed Calhoun; Calhoun attached to Boone for administrative and judicial purposes.
    formerly Fox
    · Iowa Acts 1852-1853, ch. 12, secs. 1, 4/p. 28
  3. 1855
    Changed Calhoun detached from Boone, attached to Greene "for election, judicial, and revenue purposes."
    BooneGreene
    · Iowa Acts. 1854-1855, ch. 142, sec. 1/p. 211
  4. 1855
    Changed Calhoun fully organized, detached from Greene.
    Greene
    · Swisher, "Organization of Counties," 574

Land and parcels

What the maps cover in Calhoun

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

Calhoun by the Census

Population
9,927 2020 Census count
Housing units
4,771 2020 Census count
Land area
570 square miles
Water area
2.3 square miles
People per sq mi
17 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

Calhoun 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

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Questions

Common questions about Calhoun County

When was Calhoun County founded?
Calhoun County was founded in 1851, formed from Polk County, and named after John C. Calhoun.
What is the county seat of Calhoun County?
The county seat of Calhoun County is Rockwell City.
Is there an online parcel map for Calhoun County?
Yes. Iowa Department of Homeland Security and Emergency Management (statewide parcels, mirrored by the University of Iowa) publishes a parcel map of 17,722 parcels, rated fallback here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Calhoun County's boundary or name changed?
Calhoun County was created in 1851 from Polk County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Boone County, Greene County and Fox County. It was formerly called Fox.
Is my lot in a flood zone?
We do not have flood maps for Calhoun 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