Mendham
- County:
- Morris County
- County Seat:
- No
- Area (mi²):
- 5.93
- State:
- New Jersey
Mendham is a borough located in Morris County, New Jersey. Mendham has a 2026 population of 5,000. Mendham is currently growing at a rate of 0.2% annually and its population has increased by 0.87% since the most recent census, which recorded a population of 4,957 in 2020.