
Jefferson
- County:
- Greene County
- County Seat:
- No
- Area (mi²):
- 0.606
- State:
- Pennsylvania
Jefferson is a borough located in Greene County, Pennsylvania. Jefferson has a 2025 population of 651. Jefferson is currently declining at a rate of -0.15% annually and its population has decreased by -0.76% since the most recent census, which recorded a population of 656 in 2020.
The average household income in Jefferson is $91,620 with a poverty rate of 6.82%. The median age in Jefferson is 53.5 years: 55.6 years for males, and 50.6 years for females.