Below is a list of Winthrop Harbor IL zip codes. For your research we have also included Winthrop Harbor Area Code, Time Zone, UTC and the local Lake County FIPS Code. Each Winthrop Harbor Illinois zip code has a center Longitude / Latitude point (the Winthrop Harbor center is -87.823699951172 / 42.478801727295). For your convenience we have also indicated if that zip code in Winthrop Harbor observes Daylight Savings time.