
Upper Stewartsville
- County:
- Warren County
- County Seat:
- No
- Area (mi²):
- 0.35
- State:
- New Jersey
Upper Stewartsville is a CDP located in Warren County, New Jersey. Upper Stewartsville has a 2025 population of 377. Upper Stewartsville is currently growing at a rate of 3.01% annually but its population has decreased by -0.79% since the most recent census, which recorded a population of 380 in 2020.
The average household income in Upper Stewartsville is $144,063 with a poverty rate of 0%. The median age in Upper Stewartsville is 37.7 years: 37.6 years for males, and 56.1 years for females.