Remer is a city in Cass County, Minnesota, United States. The population was 391 at the 2020 census. It is part of the Brainerd Micropolitan St…Remer is a city in Cass County, Minnesota, United States. The population was 391 at the 2020 census. It is part of the Brainerd Micropolitan Statistical Area. Minnesota State Highways 6 and 200 are two of the main arterial routes in the community.