1. Cape Henlopen Security 2870 Brownsville Rd, Harrington, DE 19952 Coordinate: 38.91362,-75.68229 Phone: (313) 312-5714
2. A D T Security Services 110 E Center St, Harrington, DE 19952 Coordinate: 38.9285,-75.57546 Phone: (302) 603-1100