- C & E Specialties, Inc. - Advertising premiums
- CMF Insurance Agency - Auto, home, life, health, business, bonds
- CadCamSystems - Resale of CadCam Systems for the Mold, Die & Pattern Industries; Also Contract Machine Shop, Specializing in Complex Shapes
- Cain and Company - advertising and marketing agency
- Caldwell Group,Inc., The - Designers and Manufacturers of Lifting Products
- Camken, Inc. - Giving Engineering Assistance and Inventorying Drive for the Rockford Industrial Community
- Campbell Science Corporation
- Camtech, A Div. of Manufacturing Technologies Group, Inc - Company specializes in CAD/CAM Software Integrations with Offices Located in Other States
- Capital Concepts, fine art, portraits, and murals
- Carlson Roofing Company - roofing contractor
- Career Link USA - an employment agency in Rockford, Illinois
- Carpet One - Flooring
- Certified Computer Service - Repairs, Upgrades & Service, On-Site or Pick-up & Delivery
- Catching Fluidpower - Industrial Distributor of Hydraulic, Pneumatic and Connector Products for Industry
- Centex Home Equity Corporation - Providing First and Second Mortgages to Non-Conforming Customers
- Century 21 - Country North, Inc. - offers Rockford real estate and relocation services. Also serves Freeport, Oregon, Belvidere, and Byron.
- CherryVale Mall - Regional Shopping Center--Largest in North Central Illinois
- Chicago Machine Tool Company - Machine Tools
- Circle Boring & Machine Company - Specialists In Precision Boring & Milling
- City Plaza Building & Suites - Executive Office Suites Rental With Professional Support Services Provided
- City Plaza Restaurant - The City Plaza Restaurant and Club 555 Lounge offer fine dining and cordiality for lunch and after hours
- Clabough Photography - Distinguished and accomplished local photographer
- CLARCOR - Manufacturer and Distributor of Environmental Filtration and Consumer Packaging Products
- CLC Lubricants Co. - Coolants, Lubricants, Cutting Oils, Quench Oils, Cleaners, Rust Preventatives, Drawing Compounds, EDM Fluids, Synthetic Industrial Fluids
- Commerce Needs
- Clinkenbeard & Associates - Rapid Prototyping Tooling
- Clock Tower Resort & Conference Center - Hotel, conference center, banquets
- Collier RV Center, Inc. - Sales & Service of High End Recreational Vehicles
- Color Corporation of America - colorants
- Colorlab - offers custom blend lipstick packages for retailers, salons, and spas
- Columbia Pipe & Supply - Plumbing, Heating, Industrial, Wholesaler
- ComEd - Electricity, Electric Power Production, Transmission and Produce, Transmit and Distribute Electricity and Distribution
- Competition Electronics - manufacturer of battery chargers for competition rc racing, and of chronographs to time shooting or archery velocity.
- Computer Resources of Rockford, Inc.
- Compuware Corporation - Software Developing Company and Computer Consulting
- COMTECH Corporation - Business Communication: Video Print Design, 3-D Animation, Inter-Action Media
- Conseco - Financial Services Organization, Acquired Local Pioneer Life Insurance Company in 1997
- Control'd Climate Distributors, Inc. - Wholesale Distribution of HVAC, Plumbing Supplies to Licensed HVAC Plg. Contractors
- Copy Systems Inc. - Copier/Facsimile Systems/Mailing Machines and Systems/Desktop Publishing/Binding Machines/Paper Shredders. Ascom Mailing and Shipping Equipment
- Cord Construction Company - Industrial, commercial, retail and institutional construction
- Cornerstone Systems, Inc. - CSI is your total solution provider for computer networking, sale of hardware, accounting software, web design, Internet set-up, e-commerce, and remote administration
- Corporate Services - specializing in industrial staffing for Northern Illinois
- Corrigan Manufacturing - Deep drawn metal specialists
- ComPortOne - Local area web site/guide
- Compuware Corporation - Software Developing Company and Computer Consulting
- Cotta Transmission Co. - power transmission products
- Cotton Peddler, The - purveyor of fine quilting goods
- Courtesy Aircraft Sales - sales of warbird and civilian aircraft.
- Crash1 Collision Centers - a network of collision repair centers in the greater Rockford area.
- Crawford, Murphy & Tilly, Inc. - Professional engineers, full-service consulting firm offering comprehensive planning, design and construction-phase services for a wide variety of engineering assignments
- Creative Silk Screen and Design, Inc. - Apparel graphic printer
- Crescent Electric Supply - Electrical Wholesale from Light bulbs to PLC's
- Crusader Clinic - serving patients unable to afford the rising cost of medical care
- CTX Mortgage Company - Home mortgages
- Cummings Advertising - Advertising agency
- Curtis Technology - Pro Audio design
- Custom Embroidery - Customized Embroidery of Promotional Items, Gifts, Clothing for Business, Clubs, Athletic Associations.
- Custom Gear & Machine, Inc. - Custom Gears for Agricultural, Heavy Machinery, Off Road Construction Vehicles
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