THE O'BRIEN COUNTY LAND BRIEF
Land in the
Loess Prairies setting.
O'Brien County has 573 square miles of land in Iowa. The mapped landscape region in O'Brien County is 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
Finding your parcel within O'Brien County
The atlas lists 8 cities, towns, townships, and Census communities associated with O'Brien County, including Sheldon, Sanborn, Primghar. The list includes overlapping geography types and does not divide the county into exclusive service areas.
O'Brien County by land and water
The Census records 0.17 square miles of water within O'Brien County, or 0% of its total area. That share is close to O'Brien County’s 0%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, O'Brien County has 421.7 times the land area of nearby Primghar city (1.36 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Buena Vista County, Cherokee County, Clay County, Dickinson County, Lyon County, Osceola County, Plymouth County, Sioux County within Iowa. A tract near one of these lines should be matched to the county identifier on its own records.

