- Cabins Cottages & Chalet Rental, Guilford
- Cafe Restaurants, Guilford
- Candy, Nut & Confectionery Wholesale & Retail, Guilford - Candy Stores
- Car Detailing & Wash Service, Guilford - Auto Detailing
- Car Rental, Guilford - Rental Cars & Lease Service
- Car Wash, Cleaning, Wax & Polish Service, Guilford
- Cardiologists, Guilford - Heart Doctors, Physicians & Surgeons (Cardiology)
- Carnivals, Fairs & Exhibitions, Guilford
- Carpenters, Guilford - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Guilford
- Carpet, Rug & Linoleum Flooring Dealers, Guilford
- Cars, Truck, Van & SUV Car Dealerships, Guilford - Auto Dealers
- Casual Dining Restaurants, Guilford
- Caterers Food Services, Guilford
- Ceiling & Electric Fans, Guilford
- Ceiling Contractors, Guilford - Ceilings
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Guilford
- Cellular & Mobile Phone Service, Guilford
- Central American Restaurants, Guilford
- Chambers Of Commerce, Guilford
- Charitable & Non-Profit Organizations, Guilford
- Chemicals & Related Products, Guilford
- Child Care & Day Care Services, Guilford
- Children's Clothing Stores, Guilford - Infant, Babies & Kids Clothing
- Chimney & Fireplace Construction Contractors, Guilford - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Guilford - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Guilford
- Chiropractor, Guilford
- Christian Churches, Guilford
- Christian Ministries, Guilford
- Churches 1 Of 3, Guilford
- Cigar, Cigarette & Tobacco Store & Supplies, Guilford
- City & County Government, Guilford
- Cleaning & Maintenance Services, Guilford
- Cleaning & Restoration Contractors, Including Sandblasting, Guilford
- Clinics, Guilford
- Clothing Stores, Guilford - Clothes & Accessories
- CNC Machine Shop, Guilford
- Coaching Business & Personal, Guilford
- Cocktail Lounges, Guilford
- Coffee, Guilford
- Coffee & Tea Stores, Guilford
- Coffee Roasting & Handling Equipment, Guilford
- Coffee, Espresso & Tea House Restaurants, Guilford
- Coin Dealers & Supplies , Guilford
- Collectibles, Guilford
- Colleges & Universities, Guilford
- Commercial & Industrial Building Contractors, Guilford
- Commercial & Literacy Writings, Guilford
- Commercial Equipment, Guilford
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- Commercial Printing Manufacturers, Guilford
- Communications Consultants, Guilford
- Communications Services, Guilford
- Community & Recreational Facilities, Guilford
- Community Services, Guilford
- Computer & Audio Visual Services, Guilford
- Computer & Laptop Repair, Guilford - PC Repair Services
- Computer & Software Stores, Guilford
- Computer Repair, Guilford
- Computer Services, Guilford
- Computer Software & Services, Guilford
- Computer Software Service, Guilford
- Computer System Consultants, Guilford - IT Consulting Services
- Computer System Designers & Consultants, Guilford
- Concrete Contractors, Guilford - Concrete Construction & Concrete Companies
- Condiments & Sauces, Guilford
- Congregational Church, Guilford
- Construction, Guilford
- Construction & Civil Engineer, Guilford
- Construction Services, Guilford
- Consultants & Services, Guilford
- Continuing Education, Guilford
- Contractor Equipment & Supplies, Guilford - Construction Equipment & Machinery
- Contractors Equipment & Supplies - Rental & Leasing, Guilford
- Convalescent Homes Placement Services, Guilford - Convalescent Care
- Convenience Stores, Guilford
- Convention & Meeting Facilities, Guilford - Meeting Rooms
- Cookie Biscuit & Cracker Manufacturers, Guilford
- Cookies, Guilford
- Cooking Services, Guilford
- Cooling System & Parts, Guilford - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copier & Copy Machine Sales, Supplies, Service & Repair, Guilford
- Copier & Copy Machine Supplies, Equipment & Parts, Guilford
- Copier Repair & Service, Guilford
- Copying & Duplicating Services, Guilford
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Guilford
- Cosmetologists, Guilford
- Cosmetology School, Guilford
- Costume Sales & Rental, Guilford
- Counseling Services, Guilford
- Credit & Debt Counseling Services, Guilford
- Cremation Services, Supplies & Equipment, Guilford
- Criminal Attorneys & Lawyers, Guilford
- Criminal Defense Attorneys & Lawyers, Guilford
- Criminal Defense Lawyers & Attorneys, Guilford
- Cruise Agents, Guilford - Travel Agents
- Cruise Lines, Guilford - Cruises
- Cushions Retail, Guilford
- Custom Sewing & Alterations, Guilford
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