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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
Jefferson County is a county located in the U.S. state of Montana. As of 2010, the population was 11,406. Its county seat is Boulder.
Jefferson County is part of the Helena Micropolitan Statistical Area.
Timeline
| Date | Event | Source
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| 1865 | County formed | Source:Red Book: American State, County, and Town Sources
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| 1865 | Court records recorded | Source:Red Book: American State, County, and Town Sources
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| 1865 | Land records recorded | Source:Red Book: American State, County, and Town Sources
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| 1865 | Probate records recorded | Source:Red Book: American State, County, and Town Sources
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| 1866 | Marriage records recorded | Source:Red Book: American State, County, and Town Sources
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| 1870 | First census | Source:Population of States and Counties of the United States: 1790-1990
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| 1895 | Birth records recorded | Source:Red Book: American State, County, and Town Sources
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| 1900 | No significant boundary changes after this year | Source:Population of States and Counties of the United States: 1790-1990
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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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| 1870 | 1,531
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| 1880 | 2,464
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| 1890 | 6,026
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| 1900 | 5,330
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| 1910 | 5,601
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| 1920 | 5,203
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| 1930 | 4,133
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| 1940 | 4,664
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| 1950 | 4,014
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| 1960 | 4,297
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| 1970 | 5,238
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| 1980 | 7,029
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| 1990 | 7,939
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Research Tips
External links
www.rootsweb.com/~mtjerrer/
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