Mantador is a city in Richland County, North Dakota, United States. The population was 67 at the 2020 census. Mantador was founded in 189…Mantador is a city in Richland County, North Dakota, United States. The population was 67 at the 2020 census. Mantador was founded in 1893. It is part of the Wahpeton, ND-MN Micropolitan Statistical Area.