Onawa is a city in Monona County, Iowa, home to about 2,839 people across 5.3 square miles. Its ZIP code is 51040.
Homes sold for a median of $150 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 Onawa. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Onawa’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Eppley Airfield (OMA)52 miles away |
|---|---|
| Closer regional airport | Sioux Gateway Airport / Brigadier General Bud Day Field (SUX)29 miles away |
| Nearest city of 250,000+ | Omaha, NE53 miles away |
| Nearest city of 1 million+ | Chicago, IL433 miles away |
Straight-line distances from the center of Onawa; 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.
Onawa had 2,906 residents in the 2020 census, down 6% since 2000.
It’s the 126th largest of 1,019 towns in Iowa by population.
Monona County grew from 17,980 residents in 1900 to 8,751 in 2020.
Monona County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 86°F in summer, and winter lows average 9°F. About 30 inches of rain and melted snow fall in a typical year, with about 31 inches of snow.
Source: NOAA 1991–2020 climate normals, Onawa 3nw, IA weather station (2 miles away).
1,935 jobs at 228 businesses in Monona County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2022 (private employers; jobs counted where people work).
30 doctors and other health care providers list an office in Onawa.
Nearest hospitals
Providers with an office here
| Primary care doctors | 7 |
|---|---|
| Specialist doctors | 2 |
| Dentists | 2 |
| Nurse practitioners and physician assistants | 9 |
| Mental health providers | 6 |
| Physical and occupational therapists | 2 |
| Chiropractors | 2 |
| Pharmacies | 5 |
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.
Parks (4 nearby)
Grocery stores (2 nearby)
Libraries (1 nearby)
Museums (2 nearby)
Theaters and performance venues (1 nearby)
Counts are within about 1.5 miles 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 West Monona Comm School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| West Monona ElementaryOnawa | Pre-K–5 | 352 | Public | 1.1 mi |
| West Monona Middle SchoolOnawa | 6–8 | 120 | Public | 1.0 mi |
| West Monona High SchoolOnawa | 9–12 | 161 | Public | 1.0 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 Turin.
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.