
Martinsville
- County:
- Somerset County
- County Seat:
- No
- Area (mi²):
- 12.152
- State:
- New Jersey
Martinsville is a CDP located in Somerset County, New Jersey. Martinsville has a 2025 population of 12,468. Martinsville is currently growing at a rate of 0.27% annually and its population has increased by 9.52% since the most recent census, which recorded a population of 11,384 in 2020.
The average household income in Martinsville is $257,330 with a poverty rate of 0.9%. The median age in Martinsville is 45.9 years: 45.8 years for males, and 45.9 years for females.