Below is a list of Union Mills IN zip codes. For your research we have also included Union Mills Area Code, Time Zone, UTC and the local La Porte County FIPS Code. Each Union Mills Indiana zip code has a center Longitude / Latitude point (the Union Mills center is -86.777496337891 / 41.493000030518). For your convenience we have also indicated if that zip code in Union Mills observes Daylight Savings time.