O'Brien County | |
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![]() Location within the U.S. state of Iowa | |
![]() Iowa's location within the U.S. | |
Coordinates: 43°04′53″N 95°37′34″W / 43.081388888889°N 95.626111111111°W | |
Country | ![]() |
State | ![]() |
Founded | January 15, 1851[1] |
Named for | William Smith O'Brien |
Seat | Primghar |
Largest city | Sheldon |
Area | |
• Total | 573 sq mi (1,480 km2) |
• Land | 573 sq mi (1,480 km2) |
• Water | 0.2 sq mi (0.5 km2) 0.03% |
Population (2020) | |
• Total | 14,182 |
• Density | 25/sq mi (9.6/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional district | 4th |
Website | obriencounty |
O'Brien County is a county in the U.S. state of Iowa. As of the 2020 United States Census, the population was 14,182.[2] The county seat is Primghar.[3]
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was invoked but never defined (see the help page).