Berlin is a city in LaMoure County, North Dakota, United States. The population was 31 at the 2020 census. Berlin was founded in 1887. B…Berlin is a city in LaMoure County, North Dakota, United States. The population was 31 at the 2020 census. Berlin was founded in 1887. Berlin is located at 46°22′42″N 98°29′16″W / 46.37833°N 98.48778°W.