|State :||Iowa (IA)|
|Total Cities in this County :||8|
|Total Zipcodes in this County :||8|
There are 1 counties in United Stated with the name O'Brien
- O'Brien county of State Iowa : *O'Brien - Iowa
O'Brien is a County which belongs to the state Iowa in United States of America. There are total 8 cities in this county. Total number of zipcodes/pincodes in O'Brien are 8.
|Flag||Name||ShortCode||Capital||Largest City||Statehood Date||Total Population||Area (Miles2/KM2)||Land Area (Miles/KM)||Water Area (Miles/KM)||House Seats||Total Counties||Total Cities||Total Zipcodes|
|Iowa||IA||Des Moines||Des Moines||December 28, 1846||3090416||56273 (145746)||55857 (144669)||416 (1077)||4||103||969||1104|