Compare Security Guards businesses in Castro Valley, California using available location, website, phone, and business profile information.
Tang currently lists 2 security guards business records in Castro Valley, California. Use the comparison below to review available contact and location information, then open each company profile for more details.
These listings are not a “best” ranking. Ratings, review counts, services, and verification dates are shown only when recorded. Nearby results, where available, are labeled separately.
Directory snapshot updated: 2026-10-12. Individual record verification dates may differ.
The first 6 listings in directory order, not a quality ranking. “-” means the information is unavailable, not zero.
| Business | Google Ratings | Reviews | Location | Website | Phone |
|---|---|---|---|---|---|
| American Global Security Inc. | 5.0 | 116 | Castro Valley, California | americanglobalsecurity.com | +1 877-482-7343 |
| ONPATROL, INC. | 5.0 | 33 | Castro Valley, California | onpatrolsecurity.org | +1 510-999-5133 |
| Bravo Security Services | 5.0 | 1 | San Lorenzo, California (nearby) | guardist.co | +1 510-398-2900 |
| All About Security Agency, Corp | 4.0 | 4 | San Leandro, California (nearby) | allaboutsecurity1.com | +1 510-839-8675 |
| CME Security Services | 5.0 | 45 | San Leandro, California (nearby) | cmesecurity.com | +1 510-992-0620 |
| Guard Enforcement Security & Patrol | 5.0 | 4 | San Leandro, California (nearby) | guardenforcement.com | +2348131174459 |
Ratings are recorded values, not independent endorsements. Confirm current availability and details directly with the business.
2 Security Guards companies in Castro Valley · showing 10 nearby within 100 miles.
American Global Security offers a broad range of guard services—including armed, unarmed, standing, vehicle patrol, and fire‑watch—across California. With over 30 years of experience, the firm provides 24/7 monitoring, real‑time guard tracking, and a free consultation. Client reviews highlight professional, responsive staff and reliable, flexible security solutions for businesses and communities.
ONPATROL, Inc. delivers comprehensive security solutions, including armed and unarmed officers, vehicle patrols, executive protection, event security, and concierge services. Their five‑tier accountability system features electronic guard tours and GPS tracking for real‑time monitoring. The company emphasizes People, Training, Processes, Technology, and Feedback, and serves over 9,000 clients worldwide, ensuring reliable protection.
Closest available companies in nearby cities.
Bravo Security Services offers a range of security solutions, including armed and unarmed guards, personal protection, firewatch, corporate and retail security, and loss prevention. The company holds a private patrol operator license (#120157) and serves major U.S. cities such as Phoenix, Dallas, Los Angeles, and San Francisco, providing reliable, licensed protection for businesses and communities.
All About Security Agency, established in 1996, offers comprehensive security solutions across Northern California, including campus, commercial, corporate, residential, retail, and special‑event protection. Services feature static guards, vehicle patrols, executive protection, permit enforcement, and community security. The firm employs advanced dispatch technology and rigorous incident‑reporting protocols for clients today.
CME Security Services offers licensed, 24/7 security solutions across the San Francisco Bay Area, including unarmed, armed, mobile patrol, event, fire‑watch, foot patrol, and integrated systems. Their multicultural team emphasizes community engagement, and client reviews highlight professionalism, responsiveness, and reliable protection for commercial, residential, and event settings throughout the region.
Guard Enforcement provides integrated security, co‑working, and tech solutions across the USA and Nigeria. With over a decade of experience, the firm serves 300+ clients using AI‑driven surveillance, IoT access control, and 24/7 monitoring. Led by veteran CEO Segun Ayanbajo, it offers licensed, insured protection and modern workspaces for businesses.
Straight Edge Solutions Agency Inc. offers a range of security services, including uniformed guards, mobile patrols, event security, access control systems, executive protection, and specialized solutions. The firm emphasizes experienced, certified personnel, customized plans, and modern technology to address diverse client needs across various industries, ensuring reliable protection and peace of mind.
Barrera Intervention offers a range of security services, including firewatch, mobile patrol, event and on‑site protection, church and residential patrol, retail loss prevention, construction security, and OC‑certified guard training. The firm emphasizes professional, courteous guards and flexible contract options for both short‑ and long‑term needs, serving diverse client industries and private clients.
Garcia's Security Training offers a range of courses for security professionals, including Initial Firearms, Power to Arrest, Firearms Requalification, Continuous Education, ECD, OC Spray, and First Aid/CPR/AED. The site also provides mobile live‑scan fingerprinting, child fingerprinting, and notary public training, with online and live registration options and an events calendar.
K‑9 Private Security offers Bay Area businesses comprehensive security solutions, including commercial, cannabis, shopping‑center, residential, educational, remote, executive, corporate‑campus, and technology services. With 15+ years experience, the firm provides licensed, trained guards, real‑time monitoring, and customized plans, earning a 5‑star client rating for rapid, reliable response and peace of mind.
South County Security offers home security solutions, including camera installation, alarm systems, smart locks, video doorbells, and 24/7 monitoring. Their process involves a direct call to a local specialist, same‑day appointments, upfront quotes, and professional installation. The site emphasizes licensed, insured technicians and a satisfaction guarantee for homeowners seeking reliable protection.
Top Flight Security offers 24‑hour private security and patrol services across the San Francisco Bay Area. The firm holds a BBB A+ rating and provides event, patrol, industrial, VIP, and emergency security solutions. With over 30 years of experience, it serves both commercial and residential clients, emphasizing reliability and professionalism.
