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County · code 17095

Knox CountyIllinois

Knox County is a county in Illinois with its seat in Galesburg, formed in 1825.

  • Founded1825
  • County seatGalesburg
  • Named forHenry Knox
  • Land area716 sq mi + 3.4 sq mi water
  • Population49,967 2020 Census
  • Parcels mapped33,239 checked 14 October 2026
Open the free map Click any parcel in Knox County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

HenryStarkFultonPeoria Galesburg Census outline · seat marked

Where it is

Knox 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 CountyLake CountyLaSalle CountyLawrence CountyLee CountyLivingston CountyLogan 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 CountyKnox County Knox
Counties of Illinois · Knox 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.

Knox County was created from Fulton County on January 13, 1825, and named after Henry Knox. In 1831, Knox gained territory from Henry and Putnam counties, with Henry attached for judicial purposes. Henry fully organized and detached from Knox in 1837, and Knox lost land to Stark County in 1839.

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

  1. 1825
    Knox County created Knox created from Fulton and Non-County Area 5 attached to Fulton.
    from Fulton
    · Ill. Laws 1824-1825, pp. 85-87, 92-96
  2. 1831
    Gained territory Knox gained from Henry and Putnam. Henry attached to Knox "for all judicial and other purposes."
    from Henryfrom Putnam
    · Ill. Laws 1830-1831, pp. 54-57, 62-63
  3. 1837
    Changed Legislature authorized creation of Coffee (proposed) from Knox, Henry, and Putnam, dependent on local referendum that failed (no change).
    CoffeeHenryPutnam
    · Ill. Laws 1836-1837, pp. 86-88
  4. 1837
    Boundary clarified Boundary between Knox and Henry was clarified (no change).
    with Henryno change
    · Ill. Laws 1836-1837, p. 89
  5. 1837
    Changed Henry fully organized, detached from Knox.
    Henry
    · Ill. Laws 1836-1837, pp. 90-91
  6. 1839
    Lost territory Knox lost to Stark.
    to Stark
    · Ill. Laws 1838-1839, pp. 229-230

Land and parcels

What the maps cover in Knox

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

Knox by the Census

Population
49,967 2020 Census count
Housing units
23,817 2020 Census count
Land area
716 square miles
Water area
3.4 square miles
People per sq mi
70 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

Knox 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 Knox 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 Knox County

When was Knox County founded?
Knox County was founded in 1825, formed from Fulton County, and named after Henry Knox.
What is the county seat of Knox County?
The county seat of Knox County is Galesburg.
Is there an online parcel map for Knox County?
Yes. Knox County publishes a parcel map of 33,239 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Knox County's boundary or name changed?
Knox County was created in 1825 from Fulton County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Henry County, Putnam County and Stark County.
Is my lot in a flood zone?
We do not have flood maps for Knox 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