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County · code 19027

Carroll CountyIowa

Carroll County is a county in Iowa with its seat in Carroll, covering 569.5 square miles.

  • Founded1851
  • County seatCarroll
  • Named forCharles Carroll of Carrollton
  • Land area569 sq mi + 0.8 sq mi water
  • Population20,760 2020 Census
  • Parcels mapped22,355 checked 15 October 2026
Open the free map Click any parcel in Carroll County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

Greene Carroll Census outline · seat marked

Where it is

Carroll on the map of Iowa

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

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Counties of Iowa · Carroll highlighted

History

Formed in 1851 from Pottawattamie County and Polk County

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

Carroll County was created on January 15, 1851, from Pottawattamie County and Non-County Area 9, which was attached to Polk County. In its early years, Carroll County was attached to Shelby County for revenue, election, and judicial purposes starting in 1853, then transferred to Guthrie County in 1855. Carroll County became fully organized and detached from Guthrie County on August 17, 1855. The county was named after Charles Carroll of Carrollton.

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

  1. 1851
    Carroll County created Carroll created from Pottawattamie and Non-County Area 9 attached to Polk; Carroll not fully organized, not attached.
    from Pottawattamiefrom Polk
    · Iowa Acts 1850-1851, ch. 9, sec. 18/pp. 31-32
  2. 1853
    Changed Carroll attached to Shelby "for revenue, election, and judicial purposes".
    Shelby
    · Iowa Acts 1852-1853, ch. 8, sec. 13/p. 23
  3. 1855
    Changed Carroll detached from Shelby, attached to Guthrie "for judicial, election, and revenue purposes."
    ShelbyGuthrie
    · Iowa Acts 1854-1855, ch. 8, secs. 1-2/pp. 6-7
  4. 1855
    Changed Carroll fully organized, detached from Guthrie.
    Guthrie
    · Swisher, "Organization of Counties," 574

Land and parcels

What the maps cover in Carroll

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

Carroll by the Census

Population
20,760 2020 Census count
Housing units
9,490 2020 Census count
Land area
569 square miles
Water area
0.8 square miles
People per sq mi
36 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

Carroll 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 Carroll 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 Carroll County

When was Carroll County founded?
Carroll County was founded in 1851, formed from Pottawattamie County and Polk County, and named after Charles Carroll of Carrollton.
What is the county seat of Carroll County?
The county seat of Carroll County is Carroll.
Is there an online parcel map for Carroll County?
Yes. A public source publishes a parcel map of 22,355 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Carroll County's boundary or name changed?
Carroll County was created in 1851 from Pottawattamie County and Polk County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Guthrie County and Shelby County.
Is my lot in a flood zone?
We do not have flood maps for Carroll 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