| Business | Phone |
| Watts Security Inc 89 1st St, Cambridge 2141 | (617) 354-0800 |
| Allied Security 245 1st St, Cambridge 2142 | (617) 374-3782 |
| Us Army Reserve 201 Vassar St, Cambridge 2139 | (617) 494-8710 |
| Us Army Rotc 18 Vassar St, Cambridge 2139 | (617) 451-4993 |
| First Protective Svc Inc 413 Windsor St, Cambridge 2141 | (617) 354-4888 |
| Securitas Security Svc Usa Inc 5 Bennett St, Cambridge 2138 | (617) 354-8969 |
| Eastern Security 36 Spinelli Pl, Cambridge 2138 | (617) 491-8181 |