- Advanced Circuits
 - Denver - Manufactures printed circuit boards starting from quick turn prototype service, thru pre-production, to full production runs. - Avalon Acoustics
- Boulder
- Coherent Technologies, Inc.
- Lafayette - Engage in the development of coherent laser radar systems and subsystems with various applications in atmospheric remote sensing and in target tracking, ranging, and imaging.
- Continental Control Systems, LLC
- Boulder - Developers of WattNode: products for AC electric power measurement and energy metering.
- Equipment Resource
- Denver - Offers used circuit board assembly equipment including, surface mount, thru hole, prep, and semiconductor equipment.
- Hicks Electronic Design
- Loveland - Full service electrical engineering design firm specializing in new product and prototype development.
- Innovative Test Solutions, Inc.
- Loveland - Engineering services for automated test solutions and a selection of remanufactured parts and accessories.
- International Light Inc
- Boulder - Light Measurement Instruments: light meters, radiometers, photometers, spectroradiometers, UV detectors.
- JET Traces
- Loveland - Printed circuit board designs to specification.
- Lewis Associates Technical Recruiters
- Littleton
- MBF Microwave,Inc
- Boulder - Coaxial and waveguide switches.
- Mega Hertz
- Englewood - Amplifiers, antenna, cable, generaters, modulators, power supplies, processors, receivers, monitors and more.
- RanDesign Electronic Engineering Services
- Boulder - Providing electronic design and PCB layout engineering services.
- SAE Circuits Colorado, INC.
- Boulder - Manufacturing of printed circuit boards.
- Single Source Circuit Design
- Denver - PCB Layout services and Electronic and Mechanical Engineering support services.
- Snaptron, Inc.
- Loveland - Specializes in the manufacturing of tactile dome switches and tactile dome switch arrays.
- Technical Marketing Mfg., Inc.
- Lakewood - Supplies electrical controls, instrumentation, hardware and software for factory automation applications; sensors, touchscreens and motion controls for process industries, OEMs and research.
- Wireless Systems, Inc.
- Lakewood - Developer and integrator for telemetry and scada using existing, developed wireless communication systems.
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