Arnolds Park is a city in Dickinson County, Iowa, home to about 922 people across 1.6 square miles. Its ZIP code is 51331, and parts of 51351 are in Arnolds Park too.
Homes sold for a median of $344 per square foot in the three months ending August 2026, a seller’s market.
Mostly Arnolds Park; also West Okoboji
Mostly Milford; part is in Arnolds Park
Each card is that ZIP code’s whole market, including any part outside Arnolds Park. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Arnolds Park’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Minneapolis–Saint Paul International Airport / Wold–Chamberlain Field (MSP)142 miles away |
|---|---|
| Closer regional airport | Fort Dodge Regional Airport (FOD)73 miles away |
| Nearest city of 250,000+ | Minneapolis, MN145 miles away |
| Nearest city of 1 million+ | Chicago, IL393 miles away |
Straight-line distances from the center of Arnolds Park; 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.
Arnolds Park had 1,110 residents in the 2020 census, down 4% since 2000.
It’s the 309th largest of 1,019 towns in Iowa by population.
Dickinson County grew from 7,995 residents in 1900 to 17,703 in 2020.
Dickinson County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 83°F in summer, and winter lows average 8°F. About 29.5 inches of rain and melted snow fall in a typical year, with about 38 inches of snow.
Source: NOAA 1991–2020 climate normals, Milford 4 Nw, IA weather station (3 miles away).
7,749 jobs at 784 businesses in Dickinson 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.
Parks (8 nearby)
Grocery stores
Pharmacies
Libraries
Museums (3 nearby)
Theaters and performance venues (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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Shares ZIP codes with Milford, West Okoboji and Wahpeton.
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.