Sunnyslope was a census-designated place (CDP) in Riverside County, California, United States. The population was 4,437 at the 2000 census. On March 8, 2011, voters passed Measure A by a 54.03% YES vote, incorporating the areas of Mira Loma, Pedley, Rubidoux, Glen Avon, and Sunnyslope into the new Jurupa Valley. The effective date of incorporation will be July 1, 2011.