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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
Clayton County is a county located in the U.S. state of Iowa. It was established in 1837 and was named in honor of John M. Clayton, United States Senator from Delaware and later Secretary of State under President Zachary Taylor. The population was 18,129 in the 2010 census, a decline from 18,678 in 2000.[1][2] Its county seat is Elkader.
Timeline
| Date | Event | Source
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| 1837 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1839 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1840 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1840 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1850 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1850 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1865 | Marriage 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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| 1840 | 1,101
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| 1850 | 3,873
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| 1860 | 20,728
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| 1870 | 27,771
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| 1880 | 28,829
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| 1890 | 26,733
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| 1900 | 27,750
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| 1910 | 25,576
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| 1920 | 25,032
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| 1930 | 24,559
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| 1940 | 24,334
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| 1950 | 22,522
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| 1960 | 21,962
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| 1970 | 20,606
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| 1980 | 21,098
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| 1990 | 19,054
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Research Tips
External links
http://iagenweb.org/clayton/
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