| Business | Phone |
| Btg Security Systems 3302 Pinkney Rd, Baltimore 21215 | (410) 298-3553 |
| Protection Guard Security Syst Baltimore 21220 | (410) 529-5666 |
| Gee Cosper & Assoc Inc 1501 Sulgrave Ave # 202, Baltimore 21209 | (410) 542-9611 |
| Security Administration 5618 Belair Rd, Baltimore 21206 | (410) 483-3298 |