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Where am ILOCATED

Warren County, Illinois

Warren County, Illinois, has 16,222 residents (July 2025 estimate). Its county seat is Monmouth. It uses Central Time and covers 542 sq mi (1,405 km²) of land.

ChicagoAurora
Warren County in Illinois
Henderson CountyKnox CountyMonmouthRosevilleAlexisKirkwoodAvon
Warren County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
16,222
Land area
542 sq mi (1,405 km²)
County seat or government
Monmouth
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$67,385 ± $6,850
Median home value
$105,000 ± $6,705
Median rent, with utilities
$788 ± $90
Homes lived in by their owners
75.2% ± 2.2 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Galesburg, IL micro area, Macomb, IL micro area, Burlington, IA-IL micro area, Canton, IL micro area, and Davenport-Moline-Rock Island, IA-IL metro area
Water area
0.67 sq mi (1.74 km²)
State
Illinois
County code (FIPS)
17187
Coordinates (central point)
40.850441, -90.620223
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 Warren 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. 6140130,580 people
  2. 6146210,458 people
  3. 614103,838 people
  4. 614151,459 people
  5. 614121,392 people
  6. 614731,279 people
  7. 614471,020 people
  8. 61453677 people
  9. 61423638 people
  10. 61478420 people
  11. 61435271 people
  12. 61474221 people
All 14
  1. 61417182 people
  2. 61475180 people

14 ZIP Code areas overlap Warren 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

Warren County government website ↗ is the next stop for county offices, tax, voting, jury and records information. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Warren County, largest first

  1. Monmouth Township9,727 people
  2. Spring Grove Township1,200 people
  3. Tompkins Township1,056 people
  4. Roseville Township991 people
  5. Floyd Township570 people
  6. Sumner Township504 people
  7. Greenbush Township473 people
  8. Kelly Township435 people
  9. Ellison Township427 people
  10. Coldbrook Township299 people
  11. Hale Township249 people
  12. Berwick Township168 people
All 15
  1. Swan Township157 people
  2. Point Pleasant Township103 people
  3. Lenox Township88 people

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

School districts in Warren County, largest first

  1. Galesburg Community Unit School District 20532,619 people
  2. Monmouth-Roseville Community Unit School District 23810,403 people
  3. United Community School District 3045,900 people
  4. Abingdon-Avon Community Unit School District 2765,724 people
  5. West Central Community Unit School District 2355,481 people
  6. Bushnell-Prairie City Community Unit School District 1703,723 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. Monmouth, Illinois (city)8,581 people
  2. Roseville, Illinois (village)823 people
  3. Alexis, Illinois (village)814 people
  4. Kirkwood, Illinois (village)754 people
  5. Avon, Illinois (village)694 people
  6. Little York, Illinois (village)379 people
  7. Cameron, Illinois (CDP)280 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Henderson County, Illinois17 mi west
  2. Knox County, Illinois22 mi east
  3. Mercer County, Illinois25 mi north
  4. McDonough County, Illinois27 mi south
  5. Fulton County, Illinois34 mi southeast

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.