Onslow is a city in Jones County, Iowa, home to about 284 people across 0.2 square miles. Its ZIP code is 52321.
Homes sold for a median of $45 per square foot in the three months ending August 2026.
Each card is that ZIP code’s whole market, including any part outside Onslow. 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)142 miles away |
|---|---|
| Closer regional airport | Dubuque Regional Airport (DBQ)26 miles away |
| Nearest city of 250,000+ | Madison, WI105 miles away |
| Nearest city of 1 million+ | Chicago, IL172 miles away |
Straight-line distances from the center of Onslow; 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.
Onslow had 201 residents in the 2020 census, down 10% since 2000.
It’s the 618th largest of 1,019 towns in Iowa by population.
Jones County grew from 21,954 residents in 1900 to 20,646 in 2020.
Jones 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 11°F. About 39.6 inches of rain and melted snow fall in a typical year, with about 31 inches of snow.
Source: NOAA 1991–2020 climate normals, Cascade, IA weather station (13 miles away).
4,620 jobs at 514 businesses in Jones 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 (1 nearby)
Libraries
Museums
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.