Below is a list of Smithfield NC zip codes. For your research we have also included Smithfield Area Code, Time Zone, UTC and the local Johnston County FIPS Code. Each Smithfield North Carolina zip code has a center Longitude / Latitude point (the Smithfield center is -78.347503662109 / 35.511798858643). For your convenience we have also indicated if that zip code in Smithfield observes Daylight Savings time.