St. Charles is a city in Madison County, Iowa, home to about 914 people across 0.6 square miles. Its ZIP code is 50240.
Homes sold for a median of $288 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 St. Charles. 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)19 miles away |
|---|---|
| Nearest city of 250,000+ | Omaha, NE116 miles away |
| Nearest city of 1 million+ | Chicago, IL319 miles away |
Straight-line distances from the center of St. Charles; 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.
St. Charles had 640 residents in the 2020 census, up 3% since 2000.
It’s the 312th largest of 1,019 towns in Iowa by population.
Madison County grew from 17,710 residents in 1900 to 16,548 in 2020.
Madison County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 84°F in summer, and winter lows average 10°F. About 34.8 inches of rain and melted snow fall in a typical year, with about 31 inches of snow.
Source: NOAA 1991–2020 climate normals, Winterset 1s, IA weather station (10 miles away).
2,850 jobs at 435 businesses in Madison County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
2 doctors and other health care providers list an office in St. Charles.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Mental health providers | 1 |
| Pharmacies | 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.
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.
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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.