Mountain Lakes
- County:
- Morris County
- County Seat:
- No
- Area (mi²):
- 2.644
- State:
- New Jersey
Mountain Lakes is a borough located in Morris County, New Jersey. Mountain Lakes has a 2026 population of 4,644. Mountain Lakes is currently growing at a rate of 0.17% annually and its population has increased by 4.08% since the most recent census, which recorded a population of 4,462 in 2020.