Lacon is a city in Marshall County, Illinois, home to about 1,916 people across 1.6 square miles. Its ZIP code is 61540.
Homes sold for a median of $87 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 Lacon. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Chicago Midway International Airport (MDW)100 miles away |
|---|---|
| Closer regional airport | General Wayne A. Downing Peoria International Airport (PIA)29 miles away |
| Nearest city of 250,000+ | Chicago, IL105 miles away |
Straight-line distances from the center of Lacon; 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.
Lacon had 1,878 residents in the 2020 census, down 5% since 2000.
It’s the 517th largest of 1,450 towns in Illinois by population.
Marshall County grew from 16,370 residents in 1900 to 11,742 in 2020.
Marshall County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 87°F in summer, and winter lows average 18°F. About 38.6 inches of rain and melted snow fall in a typical year, with about 25 inches of snow.
Source: NOAA 1991–2020 climate normals, Lacon, IL weather station (about a mile away).
2,900 jobs at 235 businesses in Marshall County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
13 doctors and other health care providers list an office in Lacon.
Nearest hospitals
Providers with an office here
| Nurse practitioners and physician assistants | 1 |
|---|---|
| Mental health providers | 2 |
| Physical and occupational therapists | 4 |
| Optometrists | 2 |
| Chiropractors | 4 |
| Pharmacies | 2 |
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 (2 nearby)
Grocery stores (1 nearby)
Pharmacies (1 nearby)
Libraries (1 nearby)
Counts are within about 1 mile 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 Midland CUSD 7. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Midland Elementary SchoolLacon | Pre-K–4 | 249 | Public | 0.3 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.