Below is a list of Merrillville IN zip codes. For your research we have also included Merrillville Area Code, Time Zone, UTC and the local Lake County FIPS Code. Each Merrillville Indiana zip code has a center Longitude / Latitude point (the Merrillville center is -87.378799438477 / 41.472099304199). For your convenience we have also indicated if that zip code in Merrillville observes Daylight Savings time.