- Antenna Research Associates
 - Beltsville - Manufacturers of antennas and accessories for communications and EMC testing. - Armed Forces Communications and Electronics Association
- Fairfax - Professional and trade association representing producers, manufacturers and users of communications, electronic intelligence and information systems.
- Bradley Broadcast and Pro Audio
- Frederick - Catalogue and mail-order distributor of audio and transmission equipment for broadcast users.
- BTI Communications
- Rockville - Offering DISH Network digital satellite TV systems and more.
- Electronic Contract Assemblers
- Frederick - Serving printed circuit board assembly, cable assembly, electro-mechanical assembly, surface mount prototyping, and SMT assembly needs.
- Electronic Industries Alliance (EIA)@
- Hyperlabs
- Frederick - Electronics research and development firm.
- Lumitek International, Inc.
- Rockville - Manufactures custom photonics products: sensor cards, electroluminescent (EL) lamps, and laser protection devices.
- Metratek, Inc.
- Reston - High-performance radar and sonar systems for remote sensing and target measurements.
- Patapsco Designs, Inc.
- Frederick - Custom design and contract manufacturing of electronic assemblies.
- Potomac Photonics, Inc.
- Lanham - Manufactures laser machine tools for high precision micromanufacturing and provides contract services, including process development, prototyping and production runs.
- Schonstedt Instrument Company
- Reston - Manufactures devices used for the detection of hidden ferrous targets, buried pipes and cables; also a line of geological laboratory instruments.
- System Planning Corporation@
- XonTech Inc.@
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