
Mercer
- County:
- Mercer County
- County Seat:
- Yes
- Area (mi²):
- 1.157
- State:
- Pennsylvania
Mercer is a borough located in Mercer County, Pennsylvania. Mercer has a 2025 population of 1,900. It is also the county seat of Mercer County. Mercer is currently declining at a rate of -0.84% annually and its population has decreased by -4.14% since the most recent census, which recorded a population of 1,982 in 2020.
The average household income in Mercer is $75,468 with a poverty rate of 15.27%. The median age in Mercer is 39.5 years: 36.1 years for males, and 45.8 years for females.