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County · code 17115

Macon CountyIllinois

Macon County is a county in Illinois, with its seat in Decatur. It was formed on January 19, 1829.

  • Founded1829
  • County seatDecatur
  • Named forNathaniel Macon
  • Land area581 sq mi + 5.2 sq mi water
  • Population103,998 2020 Census
  • Parcels mapped57,096 checked 16 October 2026
Open the free map Click any parcel in Macon County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

De WittMoultrieChristianLoganShelbySangamon Decatur Census outline · seat marked

Where it is

Macon 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 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 CountyMacon County Macon
Counties of Illinois · Macon highlighted

History

Formed in 1829 from Shelby County

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

Macon County was created from Shelby County and was named after Nathaniel Macon. Over the following decades, the county's boundaries shifted as new counties were carved from it: De Witt County in 1839, Piatt County in 1841, and Moultrie County in 1843. In 1839, Macon County also gained land from Sangamon County.

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

  1. 1829
    Macon County created Macon created from all of Non-County Area 7 attached to Shelby.
    from Shelby
    · Ill. Rev. Code 1828-1829, pp. 28-31
  2. 1839
    Lost territory Macon lost to creation of De Witt.
    to De Witt
    · Ill. Laws 1838-1839, pp. 199-201
  3. 1839
    Gained territory Macon gained from Sangamon.
    from Sangamon
    · Ill. Laws 1838-1839, p. 265
  4. 1841
    Lost territory Macon lost to creation of Piatt.
    to Piatt
    · Ill. Laws 1840-1841, pp. 71-74
  5. 1841
    Changed Legislature authorized creation of Okaw (proposed) from Macon and Shelby, dependent on local referendum that failed (no change).
    OkawShelby
    · Ill. Laws 1840-1841, pp. 80-83
  6. 1843
    Lost territory Macon lost to creation of Moultrie.
    to Moultrie
    · Ill. Laws 1842-1843, pp. 83-85

Land and parcels

What the maps cover in Macon

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

Macon by the Census

Population
103,998 2020 Census count
Housing units
49,727 2020 Census count
Land area
581 square miles
Water area
5.2 square miles
People per sq mi
179 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

Macon 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 Macon 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 Macon County

When was Macon County founded?
Macon County was founded in 1829, formed from Shelby County, and named after Nathaniel Macon.
What is the county seat of Macon County?
The county seat of Macon County is Decatur.
Is there an online parcel map for Macon County?
Yes. A public source publishes a parcel map of 57,096 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Macon County's boundary or name changed?
Macon County was created in 1829 from Shelby County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving De Witt County, Moultrie County and Piatt County.
Is my lot in a flood zone?
We do not have flood maps for Macon 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