Tunker, IndianaTunker is an unincorporated community in Washington [Township, Whitley County, Indiana|Washington Township], Whitley [County, Indiana|Whitley County], in the U.S. state of Indiana.HistoryTunker was founded in 1839, and was named after a family of settlers, the Tunker family. A post office was established in Tunker in 1886, and remained in operation until it was discontinued in 1904.GeographyTunker is located at.