Oberon is a city in Benson County, North Dakota, United States. The population was 101 at the 2020 census. Oberon was founded in 188…Oberon is a city in Benson County, North Dakota, United States. The population was 101 at the 2020 census. Oberon was founded in 1886. According to the United States Census Bureau, the city has a total area of 0.34 square miles, all land.