Menifee, California is city, centrally located in southwestern Riverside County, California, United States. Located roughly 8.5 miles north of Murrieta, the city is roughly 50 square miles in size. It had a population of about 77,519 at the 2010 United States Census, and is anticipated to reach 100,000 by 2020. The incorporated City of Menifee includes the communities of Menifee, Sun City, Quail Valley, Paloma Valley and portions of Romoland.