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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
Union County is a county located in the US state of Ohio. According to the 2010 census, it has a population of 52,300, which is an increase of 27.8% from 40,909 in 2000. Its county seat is Marysville and its name is reflective of its origins, it being the union of pieces of Franklin, Delaware, Madison, and Logan counties.
Union County is part of the Columbus, Ohio Metropolitan Statistical Area.
Timeline
| Date | Event | Source
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| 1811 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1820 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1820 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1820 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1820 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1820 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1820 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1867 | 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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| 1820 | 1,996
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| 1830 | 3,192
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| 1840 | 8,422
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| 1850 | 12,204
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| 1860 | 16,507
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| 1870 | 18,730
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| 1880 | 22,375
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| 1890 | 22,860
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| 1900 | 22,342
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| 1910 | 21,871
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| 1920 | 20,918
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| 1930 | 19,192
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| 1940 | 20,012
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| 1950 | 20,687
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| 1960 | 22,853
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| 1970 | 23,786
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| 1980 | 29,536
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| 1990 | 31,969
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Research Tips
External links
www.co.union.oh.us/
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