Fairdale is a city in Walsh County, North Dakota, United States. The population was 30 at the 2020 census. Fairdale was founded in 1905…Fairdale is a city in Walsh County, North Dakota, United States. The population was 30 at the 2020 census. Fairdale was founded in 1905. According to the United States Census Bureau, the city has a total area of 0.31 square miles, all land.