Hours Of Operations ADT California El Cajon ADT Hours of Operation and Locations in El Cajon, CA 4.7 - 140 votes 2 Locations in El Cajon www.adt.com ADT Hours Category: Home & Garden ADT - El Cajon, CA 92021 1651 E Main St(619) 308-6867 View Store Details ADT - El Cajon, CA 92020 415 Parkway Plz(619) 308-6867 View Store Details Explore El CajonView More Apparel MarshallsRoss Dress for LessBig LotsFrederick's of HollywoodCarhartt Sports TargetBig 5 Sporting GoodsDick's Sporting GoodsSports FeverZumiez Jewelry MarshallsZalesKohl's OutletKay JewelersAvon Recommend For You Stacy Furniture Build-A Bear Workshop J. C. Penney 84 Lumber A.C. Moore Arts & Crafts Adams Golf American Standard American TV & Appliance Andersen Windows & Doors Andronico's Market