O Brien County (O'Brien County), Iowa
O Brien County: County in Iowa, United States
About
O'Brien County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 14,398 and a population density of 10 people per km². After 10 years in 2020 county had an estimated population of 13,679 inhabitants. Its county seat is Primghar. The county was created 174 years ago in 1850.
Quick Facts about O'Brien County
| Population : | 13,679 (2020) |
| Country : | United States of America |
| State : | Iowa (United States) |
| Area : | 1485 km2 |
| Water as percent of area : | 0.03% |
| Land as percent of area : | 99.97% |
| Named for : | William Smith O'Brien |
| Altitude : | 1,522 feet / 464 meters |
| Capital : | Primghar |
| Establishment : | January 01, 1851 |
| Time Zone : | America/Chicago |
| Local time : | 10:37:38 (22nd February 2025) |
| Density : | 9 Pop. per km² as of 2020 |
| Population growth : | -5.26% (2010-2020) |
Geography
O'Brien County is located at 43°5'2"N 95°37'30"W (43.0837500, -95.6248800). It has 2 neighbors: Cherokee County and Osceola County.
O Brien County map
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The largest city of O'Brien County is Sheldon with a population of 5,071. Other cities include, Hartley population 1,556, Sanborn population 1,390, Paullina population 965 and Primghar population 858. See all O'Brien County cities & populated places.
O'Brien County Populated Places
Cities, towns, neighborhoods & other populated places in O'Brien County.
| City Name | Population | Title |
|---|---|---|
| Sheldon | 5,071 | City in Iowa, United States |
| Hartley | 1,556 | Human settlement in O'Brien County, Iowa, United States of America |
| Sanborn | 1,390 | City in Iowa |
| Paullina | 965 | City in O'Brien County, Iowa, United States |
| Primghar | 858 | City in Iowa |
| Sutherland | 588 | City in Iowa |
| Calumet | 155 | City in Iowa |
| Archer | 123 | City in Iowa, United States |
- Official Website
Official website of O'Brien County
O'Brien County has 2 neighbours.
- Cherokee County county in Iowa, United States
- Osceola County county in Iowa, United States
- Primghar
Demographics
According to census records, the population of O'Brien County decreased by 5.26% in 10 years.
| Year | Population | % Change | Method |
| 2010 | 14,398 | - | census |
| 2011 | 14,218 | -1.27% | estimation process |
| 2012 | 14,156 | -0.44% | estimation process |
| 2013 | 14,045 | -0.79% | estimation process |
| 2014 | 14,042 | -0.02% | estimation process |
| 2015 | 13,926 | -0.83% | estimation process |
| 2016 | 13,926 | 0% | estimation process |
| 2017 | 13,774 | -1.1% | estimation process |
| 2018 | 13,798 | 0.17% | estimation process |
| 2019 | 13,753 | -0.33% | estimation process |
| 2020 | 13,679 | -0.54% | estimation process |
People born in O'Brien County (1)
Iowa politician Lester Menke was born in O'Brien County
Iowa Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Indiana | 820,445 | A city located in the state of Iowa. |
| Polk County | 494,281 | County in Iowa, United States |
| Linn County | 227,854 | County in Oregon, United States |
| Des Moines | 212,312 | The capital of Iowa. |
| Scott County | 173,216 | County in Tennessee, United States |
| Johnson County | 153,740 | County in Iowa, United States |
| Cedar Rapids | 134,027 | The second most populous city in Iowa. |
| Black Hawk County | 130,786 | County in Iowa, United States |
| Woodbury County | 103,138 | County in Iowa, United States of America |
| Davenport | 101,799 | The most populous city in Scott County, Iowa. |
| Story County | 98,237 | County in Iowa, United States |
| Dubuque County | 97,590 | County in Iowa, United States |
| Dallas County | 96,963 | County in Iowa, United States |
| Pottawattamie County | 93,328 | County in Iowa, United States of America |
| Sioux City | 82,651 | The second most populous city in Iowa. |
| Iowa City | 75,130 | The most populous city in Johnson County, Iowa. |
