Below is a list of Osco IL zip codes. For your research we have also included Osco Area Code, Time Zone, UTC and the local Henry County FIPS Code. Each Osco Illinois zip code has a center Longitude / Latitude point (the Osco center is -90.280097961426 / 41.347801208496). For your convenience we have also indicated if that zip code in Osco observes Daylight Savings time.