Dahlgren is a village in Hamilton County, Illinois, home to about 595 people across 1.0 square miles. Its ZIP code is 62828.
Homes sold for a median of $86 per square foot in the three months ending August 2026, a seller’s market.
Mostly Dahlgren; also Belle Prairie City
Each card is that ZIP code’s whole market, including any part outside Dahlgren. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | St. Louis Lambert International Airport (STL)101 miles away |
|---|---|
| Closer regional airport | Veterans Airport of Southern Illinois (MWA)37 miles away |
| Nearest city of 250,000+ | St. Louis, MO92 miles away |
| Nearest city of 1 million+ | Chicago, IL256 miles away |
Straight-line distances from the center of Dahlgren; 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.
Dahlgren had 504 residents in the 2020 census, down 2% since 2000.
It’s the 878th largest of 1,450 towns in Illinois by population.
Hamilton County grew from 20,197 residents in 1900 to 7,993 in 2020.
Hamilton County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 89°F in summer, and winter lows average 22°F. About 47.2 inches of rain and melted snow fall in a typical year, with about 13 inches of snow.
Source: NOAA 1991–2020 climate normals, Mcleansboro, IL weather station (9 miles away).
1,531 jobs at 175 businesses in Hamilton County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1 doctors and other health care providers list an office in Dahlgren.
Nearest hospitals
Providers with an office here
| Nurse practitioners and physician assistants | 1 |
|---|
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.
Public schools here are run by Hamilton Co CUSD 10. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Dahlgren Elem SchoolDahlgren | K–6 | 139 | Public | 2.8 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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Shares ZIP codes with Belle Prairie City.
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.