Hours Of Operations ADT Maryland Dundalk ADT Hours of Operation and Locations in Dundalk, MD 4.7 - 140 votes 1 Locations in Dundalk www.adt.com ADT Hours Category: Home & Garden ADT - Dundalk, MD 21222 (443) 503-4469 View Store Details Explore DundalkView More Apparel TJ MaxxBig LotsRainbowCoachMaurices Sports ColemanBowlers Corner Pro ShopCross Country 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