Below is a list of West Middlesex PA zip codes. For your research we have also included West Middlesex Area Code, Time Zone, UTC and the local Mercer County FIPS Code. Each West Middlesex Pennsylvania zip code has a center Longitude / Latitude point (the West Middlesex center is -80.453796386719 / 41.174301147461). For your convenience we have also indicated if that zip code in West Middlesex observes Daylight Savings time.