Hopatcong
- County:
- Sussex County
- County Seat:
- No
- Area (mi²):
- 10.882
- State:
- New Jersey
Hopatcong is a borough located in Sussex County, New Jersey. Hopatcong has a 2026 population of 14,750. Hopatcong is currently growing at a rate of 0.75% annually and its population has increased by 2.93% since the most recent census, which recorded a population of 14,330 in 2020.