- Alert Protective Services
 - Chicago - Offers home and business security systems, monitoring services, and alarm installations. - Chicago's Finest Engravers
- Chicago - Supplier of brass name tags and ribbon holder tags for police departments.
- CSP Security Products
- Chicago - Electronic locks and safes.
- Dealer Connection, Inc.
- Naperville - CCTV systems specialists.
- Denning Electronics
- Clarendon Hills - Manufacturerer's rep specialising in physical security equipment, CCTV, peripheral security, and access controls.
- DMC Security Services, Inc
- Midlothian - Burglar alarms, fire alarms, access control, and cctv for Illinois.
- EMERgency 24
- Chicago - Offers police and fire-connected security systems.
- Glavin Security Specialists
- Chicago - Residential and commercial installers.
- Identatronics
- Elk Grove Village - Provides video badge management software, instant cameras, photo die-cutters, laminators, and other supplies.
- Keyth Security Systems Inc.
- Highland Park - Alarm systems, locksmiths, safes, future proof residential wiring.
- Metronet Safe & Sound, Inc.
- Chicago - Design, sales, and installation of entertainment and security systems for home or business.
- National Locksmith, The
- Streamwood - Offers publication for professional locksmiths.
- Phoenix Systems & Service, Inc.
- Wood Dale - Specialises in designing and installing corporate access control and CCTV systems.
- Stoner Connection
- Chicago - Online catalogue of police giftware, clothing, badges, supplies and equipment. Also offers fire department giftware.
- Talk-A-Phone Co.
- Chicago - ADA compliant hands-free emergency phones for elevators, parking, airports, campuses, medical centres, access control and other applications.
- Versatile Card Technology
- Downers Grove - Specialises in the manufacture of plastic cards (credit cards, phone cards, membership cards, smart cards, etc.), in thicknesses ranging from 10mil to 30mil.
- Worldwide Security Services
- Hinsdale - Provides security guards, armed and unarmed protective forces, data and computer security, and vulnerability assessments.
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