Knox
- County:
- Clarion County
- County Seat:
- No
- Area (mi²):
- 0.562
- State:
- Pennsylvania
Knox is a borough located in Clarion County, Pennsylvania. Knox has a 2026 population of 1,074. Knox is currently declining at a rate of -0.46% annually and its population has decreased by -2.1% since the most recent census, which recorded a population of 1,097 in 2020.
The median household income in Knox is $69,000 with a poverty rate of 12.91%. The median age in Knox is 34.3 years: 33.5 years for males, and 36.8 years for females. For every 100 females there are 107.3 males.