Jefferson County
Also known as Jefferson County, Pennsylvania, Jefferson County, PA
county in Pennsylvania, United States
Key facts
- Country
- United States
- State
- Pennsylvania
- Founded
- October 1, 1830
- Named after
- Thomas Jefferson
- Seat
- Brookville
- Largest borough
- Punxsutawney
- Total
- 657 sq mi (1,700 km )
- Land
- 652 sq mi (1,690 km )
- Water
- 4.4 sq mi (11 km ) 0.7%
- Estimate 2025
- 43,255
- Density
- 66.3/sq mi (25.6/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
~11 min read
Article
Jefferson County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 44,492. Its county seat is Brookville. The county was established on March 26, 1804, from part of Lycoming County and later organized in 1830. It is named after President Thomas Jefferson. It is home to Punxsutawney Phil, the most famous groundhog that predicts when spring will come every February 2 on Groundhog Day. The county is part of the North Central region of the commonwealth.
Geography