Clark
- County:
- Mercer County
- County Seat:
- No
- Area (mi²):
- 3.011
- State:
- Pennsylvania
Clark is a borough located in Mercer County, Pennsylvania. Clark has a 2026 population of 559. Clark is currently declining at a rate of -0.53% annually and its population has decreased by -2.78% since the most recent census, which recorded a population of 575 in 2020.
The median household income in Clark is $60,000 with a poverty rate of 7.32%. The median age in Clark is 45.6 years: 51.3 years for males, and 43.7 years for females. For every 100 females there are 83.4 males.