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County · code 17135

Montgomery CountyIllinois

Montgomery County is a county in Illinois, with its seat in Hillsboro, created in 1821.

  • Founded1821
  • County seatHillsboro
  • Named forRichard Montgomery
  • Land area704 sq mi + 6 sq mi water
  • Population28,288 2020 Census
Open the free map Click any parcel in Montgomery County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

BondChristianMacoupinFayetteMadisonShelby Hillsboro Census outline · seat marked

Where it is

Montgomery 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 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 CountyMontgomery County Montgomery
Counties of Illinois · Montgomery highlighted

History

Formed in 1821 from Bond County and Madison County

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

Montgomery County was created on February 12, 1821, from Bond and Madison counties. The county was named after Richard Montgomery. In 1827, Montgomery gained territory from Fayette County, but lost land in 1839 to the creation of what is now Christian County.

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

  1. 1821
    Montgomery County created Montgomery created from Bond and Madison.
    from Bondfrom Madison
    · Ill. Laws 1820-1821, pp. 142-143
  2. 1827
    Gained territory Montgomery gained from Fayette.
    from Fayette
    · Ill. Rev. Code 1826-1827, pp. 115-117
  3. 1839
    Lost territory Montgomery lost to creation of Dane (now Christian).
    to Daneto Christian
    · Ill. Laws 1838-1839, pp. 104-107
  4. 1843
    Changed Legislature authorized creation of Audubon (proposed) from Montgomery, Fayette, and Shelby, dependent on local referendum that failed (no change).
    AudubonFayetteShelby
    · Ill. Laws 1842-1843, pp. 73-74

Land and parcels

What the maps cover in Montgomery

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

Montgomery by the Census

Population
28,288 2020 Census count
Housing units
12,511 2020 Census count
Land area
704 square miles
Water area
6 square miles
People per sq mi
40 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

Montgomery 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 Montgomery 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 Montgomery County

When was Montgomery County founded?
Montgomery County was founded in 1821, formed from Bond County and Madison County, and named after Richard Montgomery.
What is the county seat of Montgomery County?
The county seat of Montgomery County is Hillsboro.
Is there an online parcel map for Montgomery 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 Montgomery County's boundary or name changed?
Montgomery County was created in 1821 from Bond County and Madison County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Christian County, Dane County and Fayette County.
Is my lot in a flood zone?
We do not have flood maps for Montgomery 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