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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 located in the U.S. state of Ohio. As of the 2020 census, the population was 42,528. Its county seat is Celina. The county was created in 1820 and later organized in 1824. It is named for Hugh Mercer, an officer in the American Revolutionary War.
Mercer County comprises the Celina, Ohio Micropolitan Statistical Area
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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