| Place Name | Mendham |
| Place Type | Borough |
| ZIP Code(s) | 07945 |
| County | Morris County |
| Area Code(s) | 862,973 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 5,004 |
| Population Growth Rate (2010-19) | 0.00% |
| Majority Ethnicity | White 91.62% |
| Metro/Micro Stats Area | New York-Newark-Jersey City, NY-NJ-PA |
| US Congressional District(s) | New Jersey 11th |
| State Assembly Districts | 25 |
| State Senate Districts | 25 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 91.62% |
| African American | 0.94% |
| Hispanic | 0% |
| Asian | 4.22% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 3.22% |