O'Brien County, Administrative division in Iowa, United States.
The county forms a perfect square measuring 24 miles on each side, with the Little Sioux and Ocheydan rivers flowing through its territory.
The Iowa State Legislature established O'Brien County in 1851, naming it after William Smith O'Brien, who led an Irish revolt in 1848.
The first school in O'Brien County opened in 1860 with Mrs. Waterman as teacher, while the first dedicated school building appeared in Grant Township in 1869.
The county seat of Primghar maintains administrative services, including property records, driver's licenses, and election management for its 14,182 residents.
The initial courthouse consisted of a 14 by 20 feet log structure where officials carried documents in their pockets rather than storing them inside.
Location: Iowa
Inception: 1851
Capital city: Primghar
Elevation above the sea: 464 m
Shares border with: Osceola County, Cherokee County, Lyon County, Sioux County, Plymouth County, Dickinson County, Clay County, Buena Vista County
Website: http://obriencounty.com
GPS coordinates: 43.08139,-95.62611
Latest update: March 5, 2025 00:15
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