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County · code 17015

Carroll CountyIllinois

Carroll County is a county in Illinois with its county seat in Mount Carroll. It was created in 1839 and named after Charles Carroll of Carrollton.

  • Founded1839
  • County seatMount Carroll
  • Named forCharles Carroll of Carrollton
  • Land area445 sq mi + 22 sq mi water
  • Population15,702 2020 Census
Open the free map Click any parcel in Carroll County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

WhitesideStephensonJo DaviessOgleClinton, IAJackson, IA Mount Carroll Census outline · seat marked

Where it is

Carroll on the map of Illinois

Illinois has 102 counties and county equivalents, each with its own records office. Shapes with a page are links.

Adams CountyAlexander CountyBond CountyBoone CountyBrown CountyBureau CountyCalhoun CountyCass CountyChampaign CountyChristian CountyClark CountyClay CountyClinton CountyColes CountyCook CountyCrawford CountyCumberland CountyDeKalb CountyDe Witt CountyDouglas CountyDuPage CountyEdgar CountyEdwards CountyEffingham CountyFayette CountyFord CountyFranklin CountyFulton CountyGallatin CountyGreene CountyGrundy CountyHamilton CountyHancock CountyHardin CountyHenderson CountyHenry CountyIroquois CountyJackson CountyJasper CountyJefferson CountyJersey CountyJo Daviess CountyJohnson CountyKane CountyKankakee CountyKendall CountyKnox CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan CountyMcDonough CountyMcHenry CountyMcLean CountyMacon CountyMacoupin CountyMadison CountyMarion CountyMarshall CountyMason CountyMassac CountyMenard CountyMercer CountyMonroe CountyMontgomery CountyMorgan CountyMoultrie CountyOgle CountyPeoria CountyPerry CountyPiatt CountyPike CountyPope CountyPulaski CountyPutnam CountyRandolph CountyRichland CountyRock Island CountySt. Clair CountySaline CountySangamon CountySchuyler CountyScott CountyShelby CountyStark CountyStephenson CountyTazewell CountyUnion CountyVermilion CountyWabash CountyWarren CountyWashington CountyWayne CountyWhite CountyWhiteside CountyWill CountyWilliamson CountyWinnebago CountyWoodford CountyCarroll County Carroll
Counties of Illinois · Carroll highlighted

History

Formed in 1839 from Jo Daviess County

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

Carroll County was created on February 22, 1839, from Jo Daviess County.

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

  1. 1839
    Carroll County created Carroll created from Jo Daviess.
    from Jo Daviess
    · Ill. Laws 1838-1839, pp. 160-162
  2. 1841
    Changed Legislature authorized Carroll to gain from Ogle the eastern halves of townships 23 to 25 north, range 7 east, dependent on local referendum that failed (no change).
    Ogle
    · Ill. Laws 1840-1841, p. 90

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
15,702 2020 Census count
Housing units
8,159 2020 Census count
Land area
445 square miles
Water area
22 square miles
People per sq mi
35 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 1839, formed from Jo Daviess County, and named after Charles Carroll of Carrollton.
What is the county seat of Carroll County?
The county seat of Carroll County is Mount Carroll.
Is there an online parcel map for Carroll County?
Not that we have found yet. Lot lines and owners of record are kept by the county assessor's office. When a public parcel map appears, it shows here.
Has Carroll County's boundary or name changed?
Carroll County was created in 1839 from Jo Daviess County. Its boundary has been clarified one time since, with no change on the ground.
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