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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. As of the 2020 census, the population was 17,043. Its county seat is Elkader. The county 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.
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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Cemeteries
Cemeteries of Clayton County, Iowa, United States
Research Tips
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