Two Zip Codes in Huntington County Among the Areas Wealthiest August 17, 2020 Report The Greater Fort Wayne Business Weekly recently published their listing of the Top 25 Wealthiest Zip Codes in Northeast Indiana. The Roanoke zip code of 46783 was ranked 6th and the Markle zip code of 46770 was ranked 19th according to the data. Both zip codes cross County lines. The Roanoke zip code is primarily in Huntington County, however, some addresses in Allen and Whitley Counties also share the same zip code. Similarly, the Markle zip code of 46770 includes portions of both Huntington and Wells Counties. Click Here to Read the Entire List.