New Baltimore is a city in Macomb County in the U.S. state of Michigan. The population was 12,117 at the 2020 census. New Baltimore is a n…New Baltimore is a city in Macomb County in the U.S. state of Michigan. The population was 12,117 at the 2020 census. New Baltimore is a northern suburb of Metro Detroit and is located along the northern shores of Lake St. Clair.