| Business | Phone |
| California Security Inst 1027 Greenfield Dr, El Cajon 92021 | (619) 579-3200 |
| Capitol Security Svc 1027 Greenfield Dr, El Cajon 92021 | (619) 593-9300 |
| Epak9 1175 N 2nd St # 102, El Cajon 92021 | (619) 442-5771 |
| Excell Security Inc 700 N Johnson Ave # C, El Cajon 92020 | (619) 275-5828 |
| Ranger Private Patrol 1524 Graves Ave # C, El Cajon 92021 | (619) 562-9900 |
| National Public Safety 892 E Madison Ave, El Cajon 92020 | (619) 401-9431 |