Grand Traverse County is a county located in the U.S. state of Michigan. As of the 2010 census, the population was 86,986. The county seat is Traverse City.Grand Traverse County is part of the Traverse City, MI Micropolitan Statistical Area, which also includes Benzie, Kalkaska, and Leelanau counties.Interlochen, home of the Interlochen Center for the Arts is located in Green Lake Township.