Below is a list of Pentwater MI zip codes. For your research we have also included Pentwater Area Code, Time Zone, UTC and the local Oceana County FIPS Code. Each Pentwater Michigan zip code has a center Longitude / Latitude point (the Pentwater center is -86.432998657227 / 43.779998779297). For your convenience we have also indicated if that zip code in Pentwater observes Daylight Savings time.