| Business | Phone |
| Abraham Security Inc 7961 Eastern Ave, Silver Spring 20910 | (301) 589-5793 |
| Wheaton Plaza Security 11160 Veirs Mill Rd, Silver Spring 20902 | (301) 946-3203 |
| Allstate Security & Invstgtv 1320 Fenwick Ln # 105, Silver Spring 20910 | (301) 587-8866 |
| Vance Training Ctr 8455 Colesville Rd, Silver Spring 20910 | (301) 588-9654 |
| Vance Uniform Protection Svc 8455 Colesville Rd # 900, Silver Spring 20910 | (301) 588-6600 |
| United Union-Security Guards 13611 Sir Thomas Way, Silver Spring 20904 | (301) 847-3400 |
| T W Security 7961 Eastern Ave, Silver Spring 20910 | (301) 565-5410 |
| Bodyguards & Intl Security Silver Spring 20910 | (301) 585-8622 |
| Ces Security 8555 16th St, Silver Spring 20910 | (301) 608-8264 |
| Securitas Security Svc Usa Inc 8555 16th St, Silver Spring 20910 | (301) 608-1599 |
| Prince Investigative Svc Inc 8701 Georgia Ave # 608, Silver Spring 20910 | (301) 563-3333 |
| Dtm Corp 1320 Fenwick Ln, Silver Spring 20910 | (301) 589-0303 |
| Nationwide Security Agency Llc 12813 Hawkshead Ter, Silver Spring 20904 | (240) 473-0763 |
| Guardsmark Inc 8611 2nd Ave # 203, Silver Spring 20910 | (301) 650-4183 |
| Holiday International 1320 Fenwick Ln, Silver Spring 20910 | (301) 587-8101 |