Place:Jefferson, Pennsylvania, United States

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source: Getty Thesaurus of Geographic Names
source: Family History Library Catalog


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Jefferson County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 45,200. Its county seat is Brookville.

Jefferson County was established on March 26, 1804, from part of Lycoming County and named for then-President Thomas Jefferson. It is home to Punxsutawney Phil, the groundhog that predicts when spring will come every February 2 (Groundhog Day).

Contents

Timeline

Date Event Source
1804 County formed Source:Red Book: American State, County, and Town Sources
1810 First census Source:Population of States and Counties of the United States: 1790-1990
1828 Land records recorded Source:Red Book: American State, County, and Town Sources
1832 Probate records recorded Source:Red Book: American State, County, and Town Sources
1870 No significant boundary changes after this year Source:Population of States and Counties of the United States: 1790-1990

Population History

source: Source:Population of States and Counties of the United States: 1790-1990
Census Year Population
1810 161
1820 561
1830 2,025
1840 7,253
1850 13,518
1860 18,270
1870 21,656
1880 27,935
1890 44,005
1900 59,113
1910 63,090
1920 62,104
1930 52,114
1940 54,090
1950 49,147
1960 46,792
1970 43,695
1980 48,303
1990 46,083

Note: in 1850 Forest was reported with Jefferson.

Research Tips

External links

  • Outstanding guide to Jefferson County family history and genealogy resources (FamilySearch Research Wiki). Birth, marriage, and death records, censuses, wills, deeds, county histories, cemeteries, churches, newspapers, libraries, and genealogical societies.
  • www.jeffersoncountypa.com


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