Hours Of Operations ADT Maryland Cambridge ADT Hours of Operation and Locations in Cambridge, MD 4.7 - 140 votes 1 Locations in Cambridge www.adt.com ADT Hours Category: Home & Garden ADT - Cambridge, MD 21613 (443) 382-0302 View Store Details Explore CambridgeView More Apparel Carter'sRainbowTalbotsCapezioExpress Sports ColemanPro ShopJazzerciseBasic Basic Jewelry Pawn King 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