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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
Mason County is a county located in the U.S. state of Illinois. As of 2000, the population was 16,038. Its county seat is Havana, Illinois. The County is named in honor of George Mason, a member of the Virginia legislature who campaigned for the adoption of the United States Bill of Rights.
Timeline
| Date | Event | Source
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| 1827 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1841 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1841 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1841 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1841 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1850 | First census | Source:Population of States and Counties of the United States: 1790-1990
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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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| 1878 | 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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| 1850 | 5,921
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| 1860 | 10,931
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| 1870 | 16,184
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| 1880 | 16,242
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| 1890 | 16,067
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| 1900 | 17,491
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| 1910 | 17,377
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| 1920 | 16,634
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| 1930 | 15,115
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| 1940 | 15,358
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| 1950 | 15,326
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| 1960 | 15,193
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| 1970 | 16,161
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| 1980 | 19,492
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| 1990 | 16,269
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Research Tips
External links
www.outfitters.com/~ilmasonch/
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