| Business | Phone |
| Alarm One Inc 718 N Hammonds Ferry Rd, Linthicum Hts 21090 | (410) 789-4717 |
| American Burglar & Fire Alarm 720 N Hammonds Ferry Rd, Linthicum Hts 21090 | (410) 636-2000 |
| Global Traders Direct 15 Lake Front Dr, Linthicum Hts 21090 | (410) 789-4800 |