District 31 represents portions or all of the following cities in the primarily Western Riverside County region:
Corona, Eastvale, Fontana, Jurupa Valley, Menifee, Moreno Valley, Perris, Riverside, San Jacinto and incorporated communities of El Cerrito, Good Hope, Highgrove, Lakeview, Meadowbrook, Mead Valley, Nuevo & Romoland.