Below is a list of Rosemont IL zip codes. For your research we have also included Rosemont Area Code, Time Zone, UTC and the local Cook County FIPS Code. Each Rosemont Illinois zip code has a center Longitude / Latitude point (the Rosemont center is -87.886001586914 / 42.047698974609). For your convenience we have also indicated if that zip code in Rosemont observes Daylight Savings time.