| Business | Phone |
| A & F Private Security 2042 W Winton Ave # B, Hayward 94545 | (510) 782-6000 |
| Aca Security Systems Inc 21615 Hesperian Blvd, Hayward 94541 | (510) 537-1188 |
| Ekeyfocus Technology 30920 Huntwood Ave, Hayward 94544 | (510) 324-8678 |
| Hillcrest Patrol Svc 2211 American Ave # 5, Hayward 94545 | (510) 780-1100 |
| Rodbat Security Svc 22455 Maple Ct, Hayward 94541 | (510) 537-1900 |
| Shureguard Security Svc 26250 Industrial Blvd # 112, Hayward 94545 | (510) 265-1360 |
| Siemens Building Technologies 20963 Cabot Blvd, Hayward 94545 | (510) 264-0685 |
| Sos Security Inc 26250 Industrial Blvd, Hayward 94545 | (510) 266-0561 |
| Universal Security Products Hayward 94545 | (510) 785-8222 |
| South County Security Svc 225 W Winton Ave # 210, Hayward 94544 | (510) 783-2696 |
| Worldwide Security Assoc Inc 22455 Maple Ct # 306, Hayward 94541 | (510) 583-6239 |