Duncan is a community in Hancock County, Iowa, home to about 21 people across 0.8 square miles. It has no ZIP code of its own: it’s part of 50423 and 50438.
Homes sold for a median of $121 per square foot across 2 ZIP codes in the three months ending August 2026, and 0 of 2 were seller’s markets.
Mostly Britt; part is in Duncan
Mostly Garner; part is in Duncan
Each card is that ZIP code’s whole market, including any part outside Duncan. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Duncan’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Des Moines International Airport (DSM)109 miles away |
|---|---|
| Closer regional airport | Mason City Municipal Airport (MCW)17 miles away |
| Nearest city of 250,000+ | Minneapolis, MN130 miles away |
| Nearest city of 1 million+ | Chicago, IL317 miles away |
Straight-line distances from the center of Duncan; 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.
Duncan had 57 residents in the 2020 census, down 56% since 2010.
It’s the 999th largest of 1,019 towns in Iowa by population.
Hancock County grew from 13,752 residents in 1900 to 10,795 in 2020.
Hancock County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 82°F in summer, and winter lows average 6°F. About 34.3 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Britt 3e, IA weather station (4 miles away).
3,643 jobs at 302 businesses in Hancock County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2022 (private employers; jobs counted where people work).
60 doctors and other health care providers list an office in Duncan’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 12 |
|---|---|
| Dentists | 7 |
| Nurse practitioners and physician assistants | 17 |
| Mental health providers | 4 |
| Physical and occupational therapists | 11 |
| Optometrists | 3 |
| Chiropractors | 6 |
| Pharmacies | 3 |
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.
Libraries
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 Garner-Hayfield-Ventura Comm School District, West Hancock Comm School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Garner-Hayfield-Ventura Elementary SchoolGarner | Pre-K–4 | 381 | Public | 2.9 mi |
| West Hancock Elementary SchoolBritt | Pre-K–4 | 294 | Public | 7.7 mi |
| Garner-Hayfield-Ventura Middle SchoolGarner | 5–8 | 255 | Public | 2.9 mi |
| Garner-Hayfield-Ventura High SchoolGarner | 9–12 | 295 | Public | 3.1 mi |
| West Hancock High SchoolBritt | 9–12 | 161 | Public | 7.7 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 Garner, Britt, Miller, Hutchins and Hayfield.
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.