Kulm is a city in LaMoure County, North Dakota, United States. The population was 368 at the 2020 census. Kulm was founded in 1892. …Kulm is a city in LaMoure County, North Dakota, United States. The population was 368 at the 2020 census. Kulm was founded in 1892. Kulm is located at 46°18′7″N 98°56′53″W / 46.30194°N 98.94806°W. According to the United States Census Bureau, the city has a total area of 0.38 square miles, all land.