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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
Rock County is a county in the U.S. state of Wisconsin. It is included in the Janesville, Wisconsin, Metropolitan Statistical Area. As of 2010, the population was 160,331. Its county seat is Janesville.
Timeline
| Date | Event | Source
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| 1836 | 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 | Court 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 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1840 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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| 1850 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1856 | 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 | 1,701
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| 1850 | 20,750
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| 1860 | 36,690
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| 1870 | 39,030
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| 1880 | 38,823
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| 1890 | 43,220
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| 1900 | 51,203
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| 1910 | 55,538
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| 1920 | 66,150
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| 1930 | 74,206
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| 1940 | 80,173
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| 1950 | 92,778
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| 1960 | 113,913
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| 1970 | 131,970
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| 1980 | 139,420
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| 1990 | 139,510
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