Parcel Chartplaces Open the free map

County · code 17113

McLean CountyIllinois

McLean County is a county in Illinois with its seat in Bloomington, formed in 1830.

  • Founded1830
  • County seatBloomington
  • Named forJohn McLean
  • Land area1,183 sq mi + 3 sq mi water
  • Population170,954 2020 Census
  • Parcels mapped68,938 checked 16 October 2026
Open the free map Click any parcel in McLean County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

De WittWoodfordLivingstonPiattFordLoganTazewellChampaign Bloomington Census outline · seat marked

Where it is

McLean 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 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 CountyMcLean County McLean
Counties of Illinois · McLean highlighted

History

Founded in 1830

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

McLean County was created in 1830 from Tazewell County and named after John McLean. The county lost territory to the creation of Livingston County in 1837, De Witt County in 1839, and Woodford County in 1841, and exchanged territory with Woodford County in 1843.

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

  1. 1830
    McLean County created McLean created from Tazewell and Non-County Area 6 attached to Tazewell.
    from Tazewell
    · Ill. Laws 1830-1831, pp. 57-59
  2. 1837
    Lost territory McLean lost to creation of Livingston.
    to Livingston
    · Ill. Laws 1836-1837, pp. 83-85
  3. 1839
    Lost territory McLean lost to creation of De Witt.
    to De Witt
    · Ill. Laws 1838-1839, pp. 199-201
  4. 1841
    Lost territory McLean lost to creation of Woodford.
    to Woodford
    · Ill. Laws 1840-1841, pp. 84-86
  5. 1843
    Exchanged territory McLean exchanged with Woodford.
    with Woodford
    · Ill. Laws 1842-1843, p. 91
  6. 1855
    Changed Legislature authorized creation of Harrison (proposed) from McLean, Champaign, and Non-County Area 4 attached to Vermilion, dependent on local referendum that failed (no change).
    HarrisonChampaignVermilion
    · Ill. Laws 1855, pub., pp. 113-117

Land and parcels

What the maps cover in McLean

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

McLean by the Census

Population
170,954 2020 Census count
Housing units
74,855 2020 Census count
Land area
1,183 square miles
Water area
3 square miles
People per sq mi
144 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 McLean 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.

Open the free map no sign-in Pro early access

Questions

Common questions about McLean County

When was McLean County founded?
McLean County was founded in 1830, and named after John McLean.
What is the county seat of McLean County?
The county seat of McLean County is Bloomington.
Is there an online parcel map for McLean County?
Yes. A public source publishes a parcel map of 68,938 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has McLean County's boundary or name changed?
McLean County was created in 1830. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Woodford County, De Witt County and Livingston County.
Who issues building permits in McLean County?
The county's page on building permits: Building Permits. Inside a city or town, ask that city first.
Who issues septic and well permits in McLean County?
The county's page on septic systems and wells: Behavioral Health.
Is my lot in a flood zone?
We do not have flood maps for McLean 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