Aledo is a city in Mercer County, Illinois, home to about 3,668 people across 2.4 square miles. Its ZIP code is 61231.
Homes sold for a median of $93 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Aledo. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Des Moines International Airport (DSM)153 miles away |
|---|---|
| Closer regional airport | Quad City International Airport (MLI)21 miles away |
| Nearest city of 250,000+ | Madison, WI147 miles away |
| Nearest city of 1 million+ | Chicago, IL164 miles away |
Straight-line distances from the center of Aledo; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Aledo had 3,633 residents in the 2020 census, up 1% since 2000.
It’s the 401st largest of 1,450 towns in Illinois by population.
Mercer County grew from 20,945 residents in 1900 to 15,699 in 2020.
Mercer County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 13°F. About 39.2 inches of rain and melted snow fall in a typical year, with about 22 inches of snow.
Source: NOAA 1991–2020 climate normals, Aledo, IL weather station (about a mile away).
2,200 jobs at 258 businesses in Mercer County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2022 (private employers; jobs counted where people work).
28 doctors and other health care providers list an office in Aledo.
Nearest hospitals
Providers with an office here
| Primary care doctors | 7 |
|---|---|
| Dentists | 2 |
| Nurse practitioners and physician assistants | 7 |
| Mental health providers | 3 |
| Physical and occupational therapists | 5 |
| Chiropractors | 4 |
| Pharmacies | 6 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (9 nearby)
Grocery stores (1 nearby)
Pharmacies (2 nearby)
Libraries (1 nearby)
Counts are within about 1.5 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Mercer County School District 404. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Apollo Elem SchoolAledo | K–5 | 362 | Public | 1.0 mi |
| Mercer County Jr High SchoolAledo | 6–8 | 270 | Public | 1.0 mi |
| Mercer County High SchoolAledo | 9–12 | 411 | Public | 0.9 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.