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County · code 17143

Peoria CountyIllinois

Peoria County is a county in Illinois, with its seat in Peoria. It was created on January 13, 1825 from Fulton County and named after the Peoria Tribe.

  • Founded1825
  • County seatPeoria
  • Named forPeoria Tribe
  • Land area619 sq mi + 12 sq mi water
  • Population181,830 2020 Census
  • Parcels mapped90,344 checked 16 October 2026
Open the free map Click any parcel in Peoria County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

StarkTazewellMarshallFultonWoodford Peoria Census outline · seat marked

Where it is

Peoria 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 CountyCarroll 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 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 CountyPeoria County Peoria
Counties of Illinois · Peoria highlighted

History

Formed in 1825 from Fulton County

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

Peoria County was created from Fulton County and Non-County Area 5 on January 13, 1825. In 1826, Mercer and Warren were detached from Schuyler and attached to Peoria for county purposes. Warren was fully organized and detached from Peoria in 1831, and Mercer was transferred to Warren. In 1827, much of the county's non-county area was lost to the creation of Tazewell County, though Peoria gained part of Non-County Area 5 in 1845.

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

  1. 1825
    Peoria County created Peoria created from Fulton and Non-County Area 5 attached to Fulton. Non-County Area 6 attached to Peoria "for county purposes."
    from Fulton
    · Ill. Laws 1824-1825, pp. 85-87, 92-96
  2. 1826
    Changed Mercer and Warren detached from Schuyler, attached to Peoria "for county purposes."
    MercerWarrenSchuyler
    · Ill. Laws 1826, pp. 76-77
  3. 1827
    Lost territory Non-County Area 6 attached to Peoria lost to creation of Tazewell; remaining part of Non-County Area 6 was detached from Peoria, attached to Tazewell for administrative and judicial purposes.
    to Tazewell
    · Ill. Rev. Code 1826-1827, pp. 113-115; Rev. Code 1828-1829, p. 32
  4. 1831
    Changed Warren fully organized, detached from Peoria. Mercer detached from Peoria, attached to Warren "for all judicial and other purposes."
    WarrenMercer
    · Ill. Laws 1830-1831, pp. 67-68
  5. 1845
    Gained territory Peoria gained part of Non-County Area 5 ("the gore"); Non-County Area 5 eliminated. · Ill. Laws 1844-1845, p. 267

Land and parcels

What the maps cover in Peoria

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

Peoria by the Census

Population
181,830 2020 Census count
Housing units
85,074 2020 Census count
Land area
619 square miles
Water area
12 square miles
People per sq mi
294 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.

Records

Permits

Zoning and code

County government

See your own lot on these maps

Open Peoria 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 Peoria County

When was Peoria County founded?
Peoria County was founded in 1825, formed from Fulton County, and named after Peoria Tribe.
What is the county seat of Peoria County?
The county seat of Peoria County is Peoria.
Is there an online parcel map for Peoria County?
Yes. A public source publishes a parcel map of 90,344 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Peoria County's boundary or name changed?
Peoria County was created in 1825 from Fulton County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Mercer County, Warren County and Schuyler County.
Who issues building permits in Peoria County?
The county's page on building permits: Permits. Inside a city or town, ask that city first.
Is my lot in a flood zone?
We do not have flood maps for Peoria 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