Below is a list of Topeka IN zip codes. For your research we have also included Topeka Area Code, Time Zone, UTC and the local Lagrange County FIPS Code. Each Topeka Indiana zip code has a center Longitude / Latitude point (the Topeka center is -85.543701171875 / 41.539398193359). For your convenience we have also indicated if that zip code in Topeka observes Daylight Savings time.