Casnovia is a village in the U.S. state of Michigan. It is situated on the boundary between Muskegon and Kent counties and lies partially within each. The population was 316 at the 2020 census. Casnovia was founded in 1850 by Lot Fulkerson and gained a post office in 1851. It was platted in 1862 and incorporated as a village in 1875. The name is derived fro…Casnovia is a village in the U.S. state of Michigan. It is situated on the boundary between Muskegon and Kent counties and lies partially within each. The population was 316 at the 2020 census. Casnovia was founded in 1850 by Lot Fulkerson and gained a post office in 1851. It was platted in 1862 and incorporated as a village in 1875. The name is derived from the Latin words case for home and nova for new.