Ogemaw County is a county located in the U.S. state of Michigan. As of the 2020 census, the population was 20,770. The county seat is West Branch.

West Branch is a city in the U.S. state of Michigan. It is the county seat and largest incorporated settlement of Ogemaw County. The city had a population of 2,351 at the 2020 census, an increase from 2,139 at the 2010 census. West Branch is mostly surrounded by West Branch Township, but the two are administered autonomously.