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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
Mercer County is a county located in the state of Ohio, United States. According to the 2010 census, it has a population of 40,814, which is a decrease of 0.3% from 40,924 in 2000. Its county seat is Celina and is named for Hugh Mercer, an officer in the American Revolutionary War.
The Celina Micropolitan Statistical Area includes all of Mercer County.
Timeline
| Date | Event | Source
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| 1820 | County formed | 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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| 1823 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1824 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1824 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1838 | Marriage 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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| 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 | 95
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| 1830 | 1,110
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| 1840 | 8,277
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| 1850 | 7,712
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| 1860 | 14,104
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| 1870 | 17,254
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| 1880 | 21,808
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| 1890 | 27,220
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| 1900 | 28,021
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| 1910 | 27,536
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| 1920 | 26,872
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| 1930 | 25,096
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| 1940 | 26,256
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| 1950 | 28,311
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| 1960 | 32,559
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| 1970 | 35,265
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| 1980 | 38,334
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| 1990 | 39,443
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Note: In 1820 Mercer was reported as attached to Darke.
Research Tips
External links
www.mercercountyohio.org/
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