Below is a list of Mendham NJ zip codes. For your research we have also included Mendham Area Code, Time Zone, UTC and the local Morris County FIPS Code. Each Mendham New Jersey zip code has a center Longitude / Latitude point (the Mendham center is -74.600700378418 / 40.769901275635). For your convenience we have also indicated if that zip code in Mendham observes Daylight Savings time.