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Where am ILOCATED

Clark County, Illinois

Clark County, Illinois, has 15,114 residents (July 2025 estimate). Its county seat is Marshall. It uses Central Time and covers 501 sq mi (1,299 km²) of land.

ChicagoAurora
Clark County in Illinois
Vigo CountyMarshallCaseyMartinsvilleWestfieldWest Union
Clark County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
15,114
Land area
501 sq mi (1,299 km²)
County seat or government
Marshall
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$72,927 ± $4,958
Median home value
$132,400 ± $15,582
Median rent, with utilities
$861 ± $89
Homes lived in by their owners
80.3% ± 3.3 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Charleston-Mattoon, IL micro area, Terre Haute, IN metro area, and Effingham, IL micro area
Water area
3.37 sq mi (8.73 km²)
State
Illinois
County code (FIPS)
17023
Coordinates (central point)
39.332334, -87.791683
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Clark County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 6194411,261 people
  2. 624417,003 people
  3. 624204,299 people
  4. 624492,951 people
  5. 624422,671 people
  6. 619331,286 people
  7. 62474626 people
  8. 62423546 people
  9. 62477526 people
  10. 62478333 people
  11. 62413329 people

11 ZIP Code areas overlap Clark County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Clark County, largest first

  1. Marshall Township4,510 people
  2. Casey Township3,451 people
  3. Wabash Township1,855 people
  4. Martinsville Township1,556 people
  5. Westfield Township563 people
  6. Auburn Township469 people
  7. York Township430 people
  8. Anderson Township414 people
  9. Parker Township370 people
  10. Melrose Township359 people
  11. Darwin Township316 people
  12. Johnson Township302 people
All 15
  1. Orange Township278 people
  2. Dolson Township223 people
  3. Douglas Township170 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in Illinois, by county

School districts in Clark County, largest first

  1. Marshall Community Unit School District 2C7,478 people
  2. Casey-Westfield Community Unit School District 4C5,399 people
  3. Martinsville Community Unit School District 3C2,704 people
  4. Hutsonville Community Unit School District 11,946 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Marshall, Illinois (city)4,040 people
  2. Casey, Illinois (city)2,239 people
  3. Martinsville, Illinois (city)1,187 people
  4. Westfield, Illinois (village)415 people
  5. West Union, Illinois (CDP)140 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Vigo County, Indiana22 mi east
  2. Crawford County, Illinois23 mi south
  3. Edgar County, Illinois24 mi north
  4. Cumberland County, Illinois24 mi west
  5. Coles County, Illinois26 mi northwest
  6. Sullivan County, Indiana26 mi southeast
  7. Jasper County, Illinois30 mi southwest

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.