| Business | Phone |
| A T Systems 343 Cowgill St, Dover 19901 | (302) 736-3330 |
| Bennett Security Svc 335 Martin St, Dover 19901 | (302) 734-2480 |
| Commando Services Inc 25 Pinewood Acres Ave, Dover 19901 | (302) 677-0911 |
| House Watch 775 S Halsey Rd, Dover 19901 | (302) 734-8533 |