Iosco County is a county in the U.S. state of Michigan; its eastern border is formed by Lake Huron. As of the 2020 census, the population was 25,237. The county seat is Tawas City.

Henry Rowe Schoolcraft was an American geographer, geologist, and ethnologist, noted for his early studies of Native American cultures, as well as for his 1832 expedition to the source of the Mississippi River. He is also noted for his major six-volume study of Native Americans commissioned by Congress and published in the 1850s.