Below is a list of Allentown NJ zip codes. For your research we have also included Allentown Area Code, Time Zone, UTC and the local Monmouth County FIPS Code. Each Allentown New Jersey zip code has a center Longitude / Latitude point (the Allentown center is -74.584197998047 / 40.177898406982). For your convenience we have also indicated if that zip code in Allentown observes Daylight Savings time.