There are 15 US Post Offices in Chippewa County serving a total of 38,978 residents equating to 2,599 residents per post office. It's estimated that approximately 62,213 packages are handled across the 15 county post offices annually. Chippewa County is a county in the Upper Peninsula of the U.S. state of Michigan. As of the 2010 census, the population was 38,520. The county seat is Sault Ste. Marie. The county is named for the Chippewa tribe, and was set off and organized in 1826. Chippewa County comprises the Sault Ste. Marie, MI micropolitan statistical area."