| Place Name | Martinsville |
| Place Type | Census Designated Place |
| ZIP Code(s) | 08836 |
| County | Somerset County |
| Area Code(s) | 732,848,908 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 11,595 |
| Population Growth Rate (2010-19) | 1.39% |
| Majority Ethnicity | White 78.18% |
| Metro/Micro Stats Area | New York-Newark-Jersey City, NY-NJ-PA |
| US Congressional District(s) | New Jersey 7th |
| State Assembly Districts | 23 |
| State Senate Districts | 23 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 78.18% |
| African American | 1.81% |
| Hispanic | 0% |
| Asian | 14.4% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 5.6% |