O'Brien County, Iowa

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O'Brien County is a county located in the U.S. state of Iowa. As of 2000, the population was 15,102. The county seat is Primghar.[1]



O'Brien County was named for William Smith O'Brien, a leader for Irish independence in 1848, and is the only O'Brien County in the United States. O'Brien County was founded in 1851.[2]


According to the U.S. Census Bureau, the county has a total area of 573 square miles (1,485 km²), of which 573 square miles (1,484 km²) is land and 0 square miles (0 km²) (0.03%) is water.

Major highways

Adjacent counties


As of the census[3] of 2000, there were 15,102 people, 6,001 households, and 4,122 families residing in the county. The population density was 26 people per square mile (10/km²). There were 6,509 housing units at an average density of 11 per square mile (4/km²). The racial makeup of the county was 98.05% White, 0.34% Black or African American, 0.17% Native American, 0.51% Asian, 0.01% Pacific Islander, 0.47% from other races, and 0.46% from two or more races. 1.77% of the population were Hispanic or Latino of any race.

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