| Business | Phone |
| Confidential Security & Event 1855 E Riverside Dr # 263, Ontario 91761 | (909) 240-2240 |
| Cross Road Security Ontario 91762 | (909) 988-6586 |
| Guard Systems Inc 1910 S Archibald Ave, Ontario 91761 | (909) 947-5400 |
| Hill's Monitor Protection Svc 2638 S Del Norte Ave, Ontario 91761 | (951) 217-0932 |
| Hook Private Security 2063 S Hellman Ave, Ontario 91761 | (909) 930-5401 |
| Initial Security 2990 Inland Empire Blvd # 114, Ontario 91764 | (909) 989-1314 |
| Jlb Protective Svc 2445 E Guasti Rd, Ontario 91761 | (909) 937-7015 |
| Nationwide Guard 4375 E Lowell St # H, Ontario 91761 | (909) 605-0202 |
| Loyal Arms Security Svc 1550 N Carlos Ave, Ontario 91764 | (909) 944-8182 |
| Pacific Western Security 1215 E Airport Dr # 267, Ontario 91761 | (909) 983-6867 |
| Praetorian Guard 2124 S Grove Ave, Ontario 91761 | (909) 923-8360 |
| Securitas Security Svc Usa Inc 402 S Milliken Ave # G, Ontario 91761 | (909) 974-3160 |
| U S Guards Co Inc 2151 E Convention Center Way, Ontario 91764 | (909) 627-1941 |
| Worldwide Security Assoc Inc 2151 E Convention Center Way, Ontario 91764 | (909) 390-0134 |