Senate District 31 includes the southwestern portion of San Bernardino County and the northwestern portion of Riverside County. In San Bernardino County the 31st Senate District includes all of Big Bear, Grand Terrace, Highland, Loma Linda, Rancho Cucamonga, Redlands, Upland, Yucaipa, Yucca Valley, Crestline, Lake Arrowhead, Mentone, Running Springs, San Antonio Heights and portions of San Bernardino and Colton. In Riverside County the 31st Senate District includes all of Riverside, Glen Avon, Highgrove, Mira Loma, Pedley, Rubidoux, Sunnyslope and all but a small portion of Woodcrest.

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