- Cabinets & Cabinet Hardware, Hertford
- Cafe Restaurants, Hertford
- Campgrounds, Hertford
- Candy Manufacturers, Hertford
- Candy, Nut & Confectionery Wholesale & Retail, Hertford - Candy Stores
- Cars, Truck, Van & SUV Car Dealerships, Hertford - Auto Dealers
- Casual Dining Restaurants, Hertford
- Caterers Food Services, Hertford
- Chambers Of Commerce, Hertford
- Charitable & Non-Profit Organizations, Hertford
- Child Care & Day Care Services, Hertford
- Chimney Cleaning & Repair, Hertford - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Hertford
- Christian Churches, Hertford
- Church Of Christ, Hertford
- Churches 1 Of 3, Hertford
- Churches 2 Of 3, Hertford
- Churches 3 Of 3, Hertford
- Cigar, Cigarette & Tobacco Store & Supplies, Hertford
- City & County Administrative Agencies, Hertford
- City & County Government, Hertford
- Clergy, Hertford
- Clinics, Hertford
- Colleges & Universities, Hertford
- Commercial Equipment, Hertford
- Commercial Printing, Hertford
- Commercial Printing Manufacturers, Hertford
- Communications Services, Hertford
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- Community & Recreational Facilities, Hertford
- Community Centers, Hertford
- Community Services, Hertford
- Computer & Software Stores, Hertford
- Computer Repair, Hertford
- Computer Software & Services, Hertford
- Computer Software Service, Hertford
- Concrete Contractors, Hertford - Concrete Construction & Concrete Companies
- Construction, Hertford
- Construction Companies, Hertford
- Construction Equipment Rental & Leasing, Hertford
- Construction Services, Hertford
- Consultants & Services, Hertford
- Convenience Stores, Hertford
- Convention & Meeting Facilities, Hertford - Meeting Rooms
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Hertford
- Cotton Ginning Equipment & Supplies, Hertford
- Court Reporter , Hertford - Stenographer & Convention Reporters
- Credit Unions, Hertford
- Cremation Services, Supplies & Equipment, Hertford
- Criminal Attorneys & Lawyers, Hertford
- Criminal Defense Attorneys & Lawyers, Hertford
- Criminal Defense Lawyers & Attorneys, Hertford
- Crop Planting & Protecting, Hertford - Soil Preparation & Cultivating
- Curtains, Drapes & Window Treatments and Coverings, Hertford - Drapery & Upholstery Fabric Stores
- Custom Designed Replica Car Dealers, Hertford - Auto Dealers
- Cyber Cafes, Hertford
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