
Pennington
- County:
- Mercer County
- County Seat:
- No
- Area (mi²):
- 0.961
- State:
- New Jersey
Pennington is a borough located in Mercer County, New Jersey. Pennington has a 2025 population of 2,869. Pennington is currently growing at a rate of 0.53% annually and its population has increased by 2.61% since the most recent census, which recorded a population of 2,796 in 2020.
The average household income in Pennington is $206,343 with a poverty rate of 4.53%. The median age in Pennington is 49 years: 45.8 years for males, and 52.4 years for females.