Below is a list of Penobscot County ME zip codes. For your research we have also included Penobscot County Area Code, Time Zone, UTC and the local County FIPS Code. Each Penobscot County Maine zip code has a center Longitude / Latitude point (the Penobscot County center is -68.7666015625 / 45.083999633789). For your convenience we have also indicated if that zip code in Penobscot County observes Daylight Savings time.