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- source: Getty Thesaurus of Geographic Names
- source: Family History Library Catalog
- the text in this section is copied from an article in Wikipedia
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. The county seat is Primghar.
Timeline
| Date | Event | Source
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| 1851 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1857 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1860 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1860 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1860 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1870 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1880 | Birth records recorded | Source:Red Book: American State, County, and Town Sources
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Population History
- source: Source:Population of States and Counties of the United States: 1790-1990
| Census Year | Population
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| 1860 | 8
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| 1870 | 715
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| 1880 | 4,155
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| 1890 | 13,060
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| 1900 | 16,985
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| 1910 | 17,262
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| 1920 | 19,051
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| 1930 | 18,409
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| 1940 | 19,293
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| 1950 | 18,970
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| 1960 | 18,840
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| 1970 | 17,522
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| 1980 | 16,972
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| 1990 | 15,444
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Cemeteries
Cemeteries of O'Brien County, Iowa, United States
Research Tips
External links
www.rootsweb.com/~iaobrien/
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