Kalkaska County is located in the U.S. state of Michigan. As of the 2020 census, its population was 17,939. The county seat is Kalkaska.

Kalkaska is a village in the U.S. state of Michigan. Kalkaska is the county seat and only incorporated community of Kalkaska County, and is considered part of Northern Michigan. Its population was 2,132 at the 2020 census, an increase from 2,020 at the 2010 census.