Golden Valley is a city in Mercer County, North Dakota, United States. The population was 182 at the 2020 census. Golden Valley was founded i…Golden Valley is a city in Mercer County, North Dakota, United States. The population was 182 at the 2020 census. Golden Valley was founded in 1913. According to the United States Census Bureau, the city has a total area of 0.73 square miles, all land.