Charlevoix is a city in the U.S. state of Michigan. It is the county seat of Charlevoix County. Part of Northern Michigan, Charlevoix is located on an isthmus between Lake Michigan and Lake Charlevoix, bisected by the short Pine River. Charlevoix serves as the main access point for Beaver Island, the largest island in Lake Michigan, which can be accessed by Island Airways or carferry. The population of Charlevoix was 2,348 at the 2020 census.