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County · code 17107

Logan CountyIllinois

Logan County is a county in Illinois with its seat in Lincoln. It was established in 1839.

  • Founded1839
  • County seatLincoln
  • Named forJohn A. Logan
  • Land area618 sq mi + 0.9 sq mi water
  • Population27,987 2020 Census
  • Parcels mapped18,976 checked 15 October 2026
Open the free map Click any parcel in Logan County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

TazewellMenardDe WittSangamonMaconMason Lincoln Census outline · seat marked

Where it is

Logan 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 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 CountyLogan County Logan
Counties of Illinois · Logan highlighted

History

Formed in 1839 from Sangamon County

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

Logan County was created from Sangamon County on February 15, 1839, and was named after John A. Logan. The county gained territory from Tazewell County in 1840 and from De Witt County in 1845.

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

  1. 1839
    Logan County created Logan created from Sangamon.
    from Sangamon
    · Ill. Laws 1838-1839, pp. 104-107
  2. 1840
    Gained territory Logan gained from Tazewell.
    from Tazewell
    · Ill. Laws 1839-1840, spec. sess., p. 29
  3. 1845
    Gained territory Logan gained from De Witt.
    from De Witt
    · Ill. Laws 1844-1845, p. 189

Land and parcels

What the maps cover in Logan

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

Logan by the Census

Population
27,987 2020 Census count
Housing units
11,984 2020 Census count
Land area
618 square miles
Water area
0.9 square miles
People per sq mi
45 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

Logan 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 Logan 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 Logan County

When was Logan County founded?
Logan County was founded in 1839, formed from Sangamon County, and named after John A. Logan.
What is the county seat of Logan County?
The county seat of Logan County is Lincoln.
Is there an online parcel map for Logan County?
Yes. Logan County publishes a parcel map of 18,976 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Logan County's boundary or name changed?
Logan County was created in 1839 from Sangamon County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving De Witt County and Tazewell County.
Is my lot in a flood zone?
We do not have flood maps for Logan 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