Cooper Charter Township is a charter township of Kalamazoo County in the U.S. state of Michigan. The population was 10,418 at the 2020 ce…Cooper Charter Township is a charter township of Kalamazoo County in the U.S. state of Michigan. The population was 10,418 at the 2020 census, up from 10,111 at the 2010 census. The township was organized in 1837.