Below is a list of Alton IL zip codes. For your research we have also included Alton Area Code, Time Zone, UTC and the local Madison County FIPS Code. Each Alton Illinois zip code has a center Longitude / Latitude point (the Alton center is -90.149299621582 / 38.903400421143). For your convenience we have also indicated if that zip code in Alton observes Daylight Savings time.
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