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| City | Onawa |
| State | Iowa (IA) |
| County | Monona |
| Country | United States of America |
| Timezone | Central Time (America/Chicago) |
| Latitude | 42.026655 |
| Longitude | -96.097238 |
| Population | 2,839 |
| Density | 209.8 /km² |
| Incorporated | N/A |
| ZIP Code(s) | 51040 |
| Area Code | 563 |
| County Seat | Onawa |
| School District | West Monona Community School District |
Onawa is a locality in Monona County, Iowa, United States. It has a population of approximately 2,839. The population density is 209.8 people per km². Onawa is located at 42.0267°N, 96.0972°W. It observes the Central Time (America/Chicago) timezone. ZIP code: 51040.
Onawa rests on a gentle swell of land, a place where the broad Iowa prairie begins its slow, deliberate conversation with the horizon. It lies 36.2 miles south-south-east of Sioux City, IA (from Sioux City, IA: bearing 155°T), and is situated 7.5 miles south-south-east of Whiting. The sky here feels immense, an ever-present canvas that shifts from the pearly luminescence of dawn to the fiery, bruised hues of twilight, painting the scattered farmsteads and the mature trees that stand sentinel along the roads in a fleeting, golden light. The air, especially in the hush of early morning, carries the clean scent of damp earth and the distant, sweet perfume of ripening corn, a tangible presence that softens the edges of the landscape. The terrain rolls, not with dramatic drama, but with a subtle, yielding grace, hinting at the ancient forces that shaped these fertile grounds, now primarily given over to the patient cultivation of crops that stretch in orderly, vibrant rectangles towards the distant, hazy blue of the sky. The story of Onawa is one deeply entwined with the rich agricultural tapestry of Monona County, a place whose identity has been forged by the soil and the seasons. Originally settled by pioneers drawn to the fertile land, its economy has long been anchored in the bounty of the fields, with crops like corn and soybeans forming the backbone of its prosperity, their amber waves a defining feature of the summer months. The Missouri River, though not directly at its doorstep, casts a long shadow of influence, shaping trade routes and historical settlement patterns, and its presence is felt in the very character of the region. A notable landmark, the Monona County Courthouse, stands as a proud architectural echo of a bygone era, its sturdy presence a quiet testament to the enduring spirit of the community and the generations who have called this place home, fostering a culture of resilience and quiet pride.
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This page provides an embedded street and satellite map of Onawa, Iowa — switch between views using the small square in the bottom left-hand corner of the map. Coordinates: 42.026655, -96.097238. Live weather conditions are sourced directly from the National Weather Service, with current observations and a 7-day forecast also powered by Open-Meteo. Real-time local news and world news feeds keep the page current, while a Wikipedia summary or an editorially written description provides background on Onawa and Monona County.
Detailed location data for Onawa includes the ZIP code (51040), telephone area code (563), county seat of Monona County (Onawa), and school district assignment (West Monona Community School District). These are among the most commonly searched location details for any US city or town.
Location data is drawn from the USGS Geographic Names Information System (GNIS) and cross-verified against 2020 US Census records by coordinate proximity — ensuring the correct Onawa is identified even where the name is shared across multiple counties or states. Population figures are sourced from the 2020 US Census.
| Page generated | July 2026 |
| Location data | SimpleMaps US Cities Database; coordinates matched to USGS GNIS definitive data |
| Wikipedia validation | Article content matched to USGS GNIS coordinates via Wikipedia geosearch API. Location verified by proximity — not name matching alone. |