Weidman is an unincorporated community and census-designated place in Isabella County in the U.S. state of Michigan. The CDP had a population of 920 at the 2020 census. The community is located within Nottawa Township to the east and Sherman Township to the west. As an unincorporated community, Weidman has no legal autonomy of its own but does have its own post office with the 48893 ZIP Code.