O'Brien Co., IA Books Cemeteries Census
Created: Jan 15, 1851 Maps Official Records Photos Population
O'Brien Co., IA
O'Brien Co., IA was created from Non-County Area
You might consider searching in Polk Co. for earlier records.
Population
The following table details the population of the County from the first census available up through 1940.
Information is shown for 1890, but that census was mostly lost due to a fire and mishandling in the 1920's and 1930's.
Don't forget to check on the main Iowa page for links to free online versions of the census
1790 - 1800 - 1810 - 1820 - 1830 - 1840 - 1850 - 1860 8
1870 715 1880 4,155 1890 13,060 1900 16,985 1910 17,262 1920 19,051 1930 18,409 1940 19,293
Historical Census Browser. The University of Virginia, Geospatial and Statistical Data Center: http://mapserver.lib.virginia.edu

Helpful Links
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Books
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Cemeteries
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Census Records
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Maps
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Official Records
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O'Brien Co., IA Government Offices Contacts
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Birth, Death, Marriage and Estate Records
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Real Estate Transaction Records
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Photos
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email Updated 9/14/2015
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