Jefferson
- County:
- Greene County
- County Seat:
- No
- Area (mi²):
- 0.188
- State:
- Pennsylvania
Jefferson is a borough located in Greene County, Pennsylvania. Jefferson has a 2026 population of 238. Jefferson is currently declining at a rate of -1.65% annually and its population has decreased by -5.56% since the most recent census, which recorded a population of 252 in 2020.
The median household income in Jefferson is $74,450 with a poverty rate of 13.29%. The median age in Jefferson is 40.8 years: 41.8 years for males, and 36.7 years for females. For every 100 females there are 116.5 males.