O'Brien County on the map of Iowa 2024. Cities, roads, borders and directions in O'Brien County of Iowa.

O'Brien County is located in the northwestern section of Iowa. This excellent county is named after William Smith O'Brien, Irish revolutionary inspired by American ideals. The county seat of O'Brien County is Primghar. The county's area is estimated at 573 square miles. Established on Jan 15, 1851, today O'Brien County is home to 14 thousand residents. This map shows the borders of O'Brien County as well as neighboring counties, including major highways and natural objecsts as of 2024. Zoom in or out of the map using the plus/minus panel. Move the center of this map by dragging it. Also check out the satellite map of O'Brien County.