| Access Security Solutions LLC | Babajide Kofi Williams | — | (510) 356 0083 | Alarm and generators | El Sobrante · Contra Costa County | — | — |
| Alarm C C T V Edge | Gary Lynn Lawhon | — | (925) 639 6111 | Alarm and generators | Concord · Contra Costa County | — | — |
| Allied Universal® Security Services | Allied Universal® Security Services | — | (510) 839-4041 | Alarm and generators | Concord · Contra Costa County | — | — |
| B & B Locksmith And Security INC | Oleg Alex Berger | — | (415) 423 0182 | Alarm and generators | Walnut Creek · Contra Costa County | — | — |
| Bay Radio And Alarm | Bay Radio And Alarm | — | (925) 322-8995 | Alarm and generators | Walnut Creek · Contra Costa County | — | — |
| Cctv-Contra Costa Television | Cctv-Contra Costa Television | — | (925) 313-1180 | Alarm and generators | Martinez · Contra Costa County | — | — |
| Central Alarm Service | Christopher Brian Lowe | — | (925) 552 0500 | Alarm and generators | Danville · Contra Costa County | — | — |
| Contra Costa Gates | Contra Costa Gates | info@contracostagates.com | (925) 954-9696 | Alarm and generators | Concord · Contra Costa County | — | — |
| Custom Car Alarms | Custom Car Alarms | — | (925) 680-8881 | Alarm and generators | Pleasant Hill · Contra Costa County | — | — |
| Kb Security Kams INC | Kyndl Steve Buzas | — | (925) 890 0790 | Alarm and generators | Oakley · Contra Costa County | — | — |
| Logan Security Systems | Jeffrey Wayne Logan | — | (925) 325 6418 | Alarm and generators | Oakley · Contra Costa County | — | — |
| Multitude Private Security | Multitude Private Security | info@multitudexpro.com | (925) 536-1641 | Alarm and generators | Pleasant Hill · Contra Costa County | — | — |
| Plexus Security LLC | Nathan Cabacungan Jaballa | — | (925) 298 2240 | Alarm and generators | Pittsburg · Contra Costa County | — | — |
| Pratt Security Systems | Joseph Marshall Pratt | — | (408) 745 7290 | Alarm and generators | Bethel Island · Contra Costa County | — | — |
| Ronlod Doors Locks & Security | Ronlod Doors Locks & Security | — | (408) 858 0187 | Alarm and generators | Brentwood · Contra Costa County | — | — |
| Safe And Sound Security | Safe And Sound Security | — | (510) 640-8720 | Alarm and generators | Oakland · Contra Costa County | — | — |
| Simplisafe | Simplisafe | customer-support@simplisafe.co.uk | — | Alarm and generators | Concord · Contra Costa County | — | — |