May we count your visit with Google Analytics? It uses cookies and sends visit data to Google. You can change this any time under Cookie choices. Privacy

Where am ILOCATED

Mercer County, Illinois

Mercer County, Illinois, has 15,229 residents (July 2025 estimate). Its county seat is Aledo. It uses Central Time and covers 561 sq mi (1,454 km²) of land.

ChicagoAurora
Mercer County in Illinois
AledoViolaWindsorSherrard
Mercer County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
15,229
Land area
561 sq mi (1,454 km²)
County seat or government
Aledo
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$74,182 ± $7,031
Median home value
$146,700 ± $7,887
Median rent, with utilities
$786 ± $55
Homes lived in by their owners
83.8% ± 2.4 points
County type
County
Metro or micro area
Davenport-Moline-Rock Island, IA-IL metro areaOutlying county
Water area
7.49 sq mi (19.4 km²)
State
Illinois
County code (FIPS)
17131
Coordinates (central point)
41.205605, -90.741770
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 Mercer 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. 6126410,073 people
  2. 612314,962 people
  3. 612733,120 people
  4. 612812,520 people
  5. 612721,437 people
  6. 614121,392 people
  7. 614861,330 people
  8. 612621,197 people
  9. 614651,192 people
  10. 612591,053 people
  11. 612791,015 people
  12. 61260737 people
All 18
  1. 61263657 people
  2. 61476551 people
  3. 61442504 people
  4. 61472453 people
  5. 61466263 people
  6. 6127688 people

18 ZIP Code areas overlap Mercer 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 Mercer County, largest first

  1. Mercer Township3,917 people
  2. Richland Grove Township2,129 people
  3. Preemption Township2,052 people
  4. Greene Township1,391 people
  5. New Boston Township1,113 people
  6. Rivoli Township1,096 people
  7. Suez Township722 people
  8. Millersburg Township588 people
  9. Keithsburg Township490 people
  10. Eliza Township444 people
  11. Abington Township433 people
  12. Ohio Grove Township365 people
All 15
  1. North Henderson Township361 people
  2. Duncan Township215 people
  3. Perryton Township179 people

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

School districts in Mercer County, largest first

  1. Sherrard Community Unit School District 2008,704 people
  2. Mercer County School District 4047,985 people
  3. Rockridge Community Unit School District 3007,712 people
  4. United Community School District 3045,900 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. Aledo, Illinois (city)3,668 people
  2. Viola, Illinois (village)899 people
  3. Alexis, Illinois (village)814 people
  4. Windsor, Illinois (village)704 people
  5. Sherrard, Illinois (village)691 people
  6. Matherville, Illinois (village)657 people
  7. New Boston, Illinois (city)648 people
  8. Reynolds, Illinois (village)584 people
  9. Keithsburg, Illinois (city)490 people
  10. Joy, Illinois (village)387 people
  11. Seaton, Illinois (village)228 people
  12. North Henderson, Illinois (village)191 people
All 18
  1. Preemption, Illinois (CDP)127 people
  2. Cable, Illinois (CDP)122 people
  3. Swedona, Illinois (CDP)64 people
  4. Millersburg, Illinois (CDP)33 people
  5. Eliza, Illinois (CDP)0 people
  6. Hamlet, Illinois (CDP)0 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Rock Island County, Illinois20 mi northeast
  2. Warren County, Illinois25 mi south
  3. Louisa County, Iowa27 mi west
  4. Henderson County, Illinois29 mi south
  5. Des Moines County, Iowa31 mi southwest
  6. Henry County, Illinois33 mi east
  7. Knox County, Illinois33 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.