- Candy, Nut & Confectionery Wholesale & Retail, Hartford - Candy Stores
- Car Detailing & Wash Service, Hartford - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Hartford
- Casinos, Hartford
- Casual Dining Restaurants, Hartford
- Catholic Churches, Hartford
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Hartford
- Cellular & Mobile Phone Service, Hartford
- Central American Restaurants, Hartford
- Child Care & Day Care Services, Hartford
- Chiropractor, Hartford
- Churches 1 Of 3, Hartford
- Churches 2 Of 3, Hartford
- Churches 3 Of 3, Hartford
- Churches Seventh Day Adventist, Hartford
- Cigar, Cigarette & Tobacco Store & Supplies, Hartford
- City & County Administrative Agencies, Hartford
- City & County Government, Hartford
- City & County Law Enforcement, Hartford
- Cleaning & Maintenance Services, Hartford
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- CNC Machine Shop, Hartford
- Coffee, Espresso & Tea House Restaurants, Hartford
- Commercial Equipment, Hartford
- Commercial Printing Manufacturers, Hartford
- Communications Services, Hartford
- Community & Recreational Facilities, Hartford
- Community Centers, Hartford
- Community Services, Hartford
- Computer & Audio Visual Services, Hartford
- Computer & Software Stores, Hartford
- Computer Repair, Hartford
- Computer Software & Services, Hartford
- Computer Software Service, Hartford
- Computer System Consultants, Hartford - IT Consulting Services
- Construction, Hartford
- Construction Companies, Hartford
- Consultants & Services, Hartford
- Convenience Stores, Hartford
- Counseling Professionals, Hartford
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