THE MONONA COUNTY LAND BRIEF
Land in the
Missouri Alluvial Plain setting.
Monona County has 694.1 square miles of land in Iowa. 3 mapped landscape regions meet across Monona County: Missouri Alluvial Plain, Western Loess Hills, Steeply Rolling Loess Prairies.
Glacial till plains and windblown loess hills make up the Western Corn Belt landscape. Near-level and rolling terrain are interspersed with steeper river valleys and hills.
Regional context: Western Corn Belt Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Monona County intersects 3 mapped regional units. The largest mapped shares are:
- Missouri Alluvial Plain47%
- Western Loess Hills46.7%
- Steeply Rolling Loess Prairies6.3%
Finding your parcel within Monona County
The atlas lists 10 cities, towns, townships, and Census communities associated with Monona County, including Onawa, Mapleton, Whiting. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Monona County by land and water
The Census records 4.86 square miles of water within Monona County, or 0.7% of its total area. That share is close to Monona County’s 0.7%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Monona County has 7,711.9 times the land area of nearby Turin city (0.09 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Crawford County, Harrison County, Ida County, Woodbury County within Iowa. A tract near one of these lines should be matched to the county identifier on its own records.

