| Business | Phone |
| Admiral Security Svc 22 Light St # 310, Baltimore 21202 | (410) 576-0601 |
| Aegis Consultants Inc Baltimore 21217 | (410) 225-7741 |
| Alliance Security 100 N Charles St, Baltimore 21201 | (410) 576-0290 |
| Arrington & Soistman Inc 4718 Kenwood Ave, Baltimore 21206 | (410) 663-9200 |
| Bank Services Inc 8 W Hamilton St, Baltimore 21201 | (443) 460-0321 |
| Burns Security 1 South St, Baltimore 21202 | (410) 347-4033 |
| Central Security Investigation 200 S Arlington Ave, Baltimore 21223 | (410) 783-8195 |
| Cognisa Security 231 E Baltimore St # 1001, Baltimore 21202 | (410) 234-0890 |
| Crown Security Systems Inc 2203 Saint Paul St, Baltimore 21218 | (410) 235-5577 |
| Off Duty Police Security Svc 6314 Kenwood Ave, Baltimore 21237 | (410) 866-6150 |
| Direct Inc 6615 Reisterstown Rd # 305, Baltimore 21215 | (410) 547-8900 |
| Direct Security & Invstgtve 6615 Racist Towne Rd, Baltimore 21215 | (410) 585-0570 |
| Professional Security Bur Ltd 7939 Honeygo Blvd # 203, Baltimore 21236 | (410) 933-4955 |
| Expert Security 1100 Wicomico St # 545, Baltimore 21230 | (410) 962-8380 |
| Pulvirenti & Horseman Inc 8031 Park Haven Rd, Baltimore 21222 | (410) 284-4014 |
| Guardsmark Inc 101 W Read St # 208, Baltimore 21201 | (410) 528-1324 |
| Home Health Care Escort Svc 1042 Patapsco St, Baltimore 21230 | (410) 727-4292 |
| Securitas Security Svc Usa Inc 7004 Security Blvd, Baltimore 21244 | (443) 436-3200 |
| Md Protection Specialists Inc 6400 Frankford Ave # 6, Baltimore 21206 | (410) 325-5551 |
| Metro One Loss Prevention Svc 111 N Charles St, Baltimore 21201 | (410) 230-0099 |
| Metropolitan International Sec Baltimore 21209 | (410) 825-2257 |
| Allied Security 7939 Honeygo Blvd # 203, Baltimore 21236 | (410) 825-5240 |
| On-Guard Protective Svc 1632 W Lanvale St, Baltimore 21217 | (410) 383-6477 |
| Battaglia Security & Invstgtv 13198 E Greenbank Rd, Baltimore 21220 | (410) 335-8283 |
| Rite Aid Security 3935 Erdman Ave, Baltimore 21213 | (410) 534-8971 |
| Borg Warner Security 7004 Security Blvd, Baltimore 21244 | (410) 597-8622 |
| Security Dogs 611 S Addison St, Baltimore 21223 | (410) 947-4748 |
| Silver Star Security 3709 E Monument St, Baltimore 21205 | (410) 563-6929 |
| Superior Protective Svc Inc Baltimore 21215 | (410) 358-5911 |
| Watkins Security Agency Inc 2901 Druid Park Dr # A106, Baltimore 21215 | (410) 523-5080 |
| Knight Protective Svc 1521 S Edgewood St # B, Baltimore 21227 | (410) 644-6606 |
| Statewide Bureau-Investigation 1321 Rustic Ave, Baltimore 21237 | (410) 687-6609 |
| Us Security Inc 6666 Security Blvd # 4, Baltimore 21207 | (410) 277-4682 |
| Wackenhut Security Svc 6630 Baltimore National Pike, Baltimore 21228 | (410) 788-6800 |