Trommald is a city in Crow Wing County, Minnesota, United States. The population was 99 at the 2020 census. It is part of the Brainerd Micro…Trommald is a city in Crow Wing County, Minnesota, United States. The population was 99 at the 2020 census. It is part of the Brainerd Micropolitan Statistical Area. Trommald was founded as a mining town on the western end of the Cuyuna iron range, just north of Ironton.