Below is a list of Seward IL zip codes. For your research we have also included Seward Area Code, Time Zone, UTC and the local Winnebago County FIPS Code. Each Seward Illinois zip code has a center Longitude / Latitude point (the Seward center is -89.358001708984 / 42.238498687744). For your convenience we have also indicated if that zip code in Seward observes Daylight Savings time.