Charter Oak is a city in Crawford County, Iowa, home to about 580 people across 0.5 square miles. Its ZIP code is 51439.
Homes sold for a median of $76 per square foot in the three months ending August 2026, a balanced market.
Each card is that ZIP code’s whole market, including any part outside Charter Oak. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Eppley Airfield (OMA)55 miles away |
|---|---|
| Closer regional airport | Sioux Gateway Airport / Brigadier General Bud Day Field (SUX)46 miles away |
| Nearest city of 250,000+ | Omaha, NE60 miles away |
| Nearest city of 1 million+ | Chicago, IL407 miles away |
Straight-line distances from the center of Charter Oak; 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.
Charter Oak had 535 residents in the 2020 census, up 1% since 2000.
It’s the 434th largest of 1,019 towns in Iowa by population.
Crawford County grew from 21,685 residents in 1900 to 16,525 in 2020.
Crawford 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 9°F. About 32.3 inches of rain and melted snow fall in a typical year, with about 31 inches of snow.
Source: NOAA 1991–2020 climate normals, Mapleton No.2, IA weather station (11 miles away).
5,121 jobs at 415 businesses in Crawford County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
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 Charter Oak-Ute Comm School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Charter Oak-Ute Elementary SchoolCharter Oak | Pre-K–5 | 117 | Public | 0.6 mi |
| Charter Oak-Ute Junior High SchoolCharter Oak | 6–8 | 49 | Public | 0.6 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.