Sun City is a former census-designated place (CDP) in Riverside County, California, United States, and now a neighborhood of the city of Menifee, California. Along with the neighboring communities of Quail Valley and Menifee, it was incorporated as part of the City of Menifee on October 1, 2008. The population when Sun City was a CDP was 17,773 at the 2000 census. Sun City is located along Interstate 215 just south of the city of Perris.

As of the 2022 Census, there are 26,987 residents in Sun City, with a median age of 47. Of this, 49.17% are males and 50.83% are females. US-born citizens make up 85.81% of the resident pool in Sun City, while non-US-born citizens account for 9.77%.