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.

Tawas City is a city in and county seat of Iosco County in the U.S. state of Michigan. The population was 1,834 at the 2020 census. The city is mostly surrounded by Tawas Township, but the two areas are administered autonomously.