Onaga is a city in Pottawatomie County, Kansas, home to about 727 people across 0.7 square miles. Its ZIP code is 66521.
Homes sold for a median of $75 per square foot in the three months ending August 2026, a buyer’s market.
Mostly Onaga; also Wheaton
Each card is that ZIP code’s whole market, including any part outside Onaga. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Onaga’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Kansas City International Airport (MCI)79 miles away |
|---|---|
| Closer regional airport | Manhattan Regional Airport (MHK)36 miles away |
| Nearest city of 250,000+ | Kansas City, MO90 miles away |
| Nearest city of 1 million+ | Dallas, TX464 miles away |
Straight-line distances from the center of Onaga; 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.
Onaga had 679 residents in the 2020 census, down 4% since 2000.
It’s the 251st largest of 721 towns in Kansas by population.
Pottawatomie County grew from 18,470 residents in 1900 to 25,348 in 2020.
Pottawatomie County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 89°F in summer, and winter lows average 17°F. About 35.7 inches of rain and melted snow fall in a typical year, with about 33 inches of snow.
Source: NOAA 1991–2020 climate normals, Centralia, KS weather station (16 miles away).
10,572 jobs at 703 businesses in Pottawatomie County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
20 doctors and other health care providers list an office in Onaga.
Nearest hospitals
Providers with an office here
| Primary care doctors | 3 |
|---|---|
| Specialist doctors | 2 |
| Nurse practitioners and physician assistants | 6 |
| Physical and occupational therapists | 9 |
| 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.
Public schools here are run by Onaga-Havensville-Wheaton. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Onaga ElemOnaga | Pre-K–5 | 164 | Public | 0.3 mi |
| Onaga Middle SchoolOnaga | 6–8 | 76 | Public | 0.3 mi |
| Onaga Senior HighOnaga | 9–12 | 86 | Public | 0.3 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 Wheaton.
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.