Newaygo County is a county in the U.S. state of Michigan. As of the 2020 United States Census, the population was 49,978. The county seat is White Cloud. The county was created in 1840, and was organized in 1851. It was either named for an Ojibwe leader who signed the Treaty of Saginaw in 1819 or for an Algonquian word meaning "much water".