South Branch is an unincorporated community in the U.S. state of Michigan. The community is primarily located within Goodar Township, Ogemaw County, although a small portion extends east into Plainfield Township, Iosco County. As an unincorporated community, South Branch has no legally defined boundaries, population statistics, or administrative powers of its own; however, a post office operates out of the community, with ZIP Code 48761.

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