Coloma is a city in Berrien County in the U.S. state of Michigan. The population was 1,465 at the 2020 census. Coloma was incorporated …Coloma is a city in Berrien County in the U.S. state of Michigan. The population was 1,465 at the 2020 census. Coloma was incorporated as a village in 1893 and as a city in 1941. According to the United States Census Bureau, the city has a total area of 0.89 square miles, all land.