Mendham, New Jersey Area Code

Mendham, NJ is officially utilizing an area code overlay in which area codes 862 and 973 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.

In addition to Mendham, NJ area code information read more about area codes 862 and 973 details and New Jersey area codes.

Mendham, NJ is located in Morris County and observes the Eastern Time Zone. View our Times by Area Code tool.