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County · code 17023

Clark CountyIllinois

Clark County is located in Illinois and was created on March 22, 1819, from Crawford County. The county seat is Marshall.

  • Founded1819
  • County seatMarshall
  • Named forGeorge Rogers Clark
  • Land area501 sq mi + 3.4 sq mi water
  • Population15,455 2020 Census
  • Parcels mapped14,147 checked 15 October 2026
Open the free map Click any parcel in Clark County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

CrawfordEdgarVigo, INSullivan, INCumberlandColes Marshall Census outline · seat marked

Where it is

Clark 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 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 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 CountyClark County Clark
Counties of Illinois · Clark highlighted

History

Formed in 1819 from Crawford County

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

Clark County was named after George Rogers Clark. In its early years, the county lost land to the creation of Pike, Fayette, Edgar, Vermilion, and Coles counties, while gaining a small area back from Crawford County in 1822.

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

  1. 1819
    Clark County created Clark created from Crawford.
    from Crawford
    · Ill. Laws 1819, pp. 166-167
  2. 1821
    Lost territory Clark lost to creation of Pike.
    to Pike
    · Ill. Laws 1820-1821, p. 59
  3. 1821
    Lost territory Clark lost to creation of Fayette.
    to Fayette
    · Ill. Laws 1820-1821, pp. 164-167
  4. 1822
    Gained territory Clark gained small area from Crawford.
    from Crawford
    · Ill. Laws 1822-1823, p. 79
  5. 1823
    Lost territory Clark lost to creation of Edgar and to creation of Non-County Area 4.
    to Edgar
    · History of Edgar, 514-515; Ill. Laws 1822-1823, pp. 74-75
  6. 1826
    Lost territory Clark lost to creation of Vermilion and lost to Non-County Area 4.
    to Vermilion
    · Ill. Laws 1826, pp. 50-53
  7. 1830
    Lost territory Clark lost to creation of Coles.
    to Coles
    · Ill. Laws 1830-1831, pp. 59-61

Land and parcels

What the maps cover in Clark

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

Clark by the Census

Population
15,455 2020 Census count
Housing units
7,327 2020 Census count
Land area
501 square miles
Water area
3.4 square miles
People per sq mi
31 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

Clark 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 Clark 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 Clark County

When was Clark County founded?
Clark County was founded in 1819, formed from Crawford County, and named after George Rogers Clark.
What is the county seat of Clark County?
The county seat of Clark County is Marshall.
Is there an online parcel map for Clark County?
Yes. Clark County publishes a parcel map of 14,147 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Clark County's boundary or name changed?
Clark County was created in 1819 from Crawford County. Since then the Atlas of Historical County Boundaries records 6 later changes, chiefly involving Coles County, Crawford County and Edgar County.
Is my lot in a flood zone?
We do not have flood maps for Clark 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