Riverdale is a city in southern Weber County, Utah, United States. The population was 8,426 at the 2010 census. It is part of the Ogden–Cle…Riverdale is a city in southern Weber County, Utah, United States. The population was 8,426 at the 2010 census. It is part of the Ogden–Clearfield, Utah Metropolitan Statistical Area. According to the United States Census Bureau, the city has a total area of 4.4 square miles, all land.