- Cabinets & Cabinet Hardware, Stonington
- Cabinets Refacing, Refinishing & Building, Stonington - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cafe Restaurants, Stonington
- Campgrounds, Stonington
- Car Rental, Stonington - Rental Cars & Lease Service
- Carpenters, Stonington - Carpentry Contractors
- Carpet, Rug & Linoleum Flooring Dealers, Stonington
- Cars, Truck, Van & SUV Car Dealerships, Stonington - Auto Dealers
- Casual Dining Restaurants, Stonington
- Caterers Food Services, Stonington
- Ceramic Tile, Stonington - Wholesale, Manufacturers & Suppliers
- Child Care & Day Care Services, Stonington
- Chinese Restaurants, Stonington
- Christian Churches, Stonington
- Christmas Decorations & Lights, Stonington
- Church Of Christ, Stonington
- Churches 1 Of 3, Stonington
- Churches 2 Of 3, Stonington
- Cigar, Cigarette & Tobacco Store & Supplies, Stonington
- City & County Government, Stonington
- Cleaning & Restoration Contractors, Including Sandblasting, Stonington
- CNC Machine Shop, Stonington
- Coaching Business & Personal, Stonington
- Coffee, Espresso & Tea House Restaurants, Stonington
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- Colleges & Universities, Stonington
- Commercial Equipment, Stonington
- Commercial Printing Manufacturers, Stonington
- Commercial, Industrial & Office Space for Rent & Lease, Stonington
- Community Services, Stonington
- Computer & Audio Visual Services, Stonington
- Computer & Laptop Repair, Stonington - PC Repair Services
- Computer & Software Stores, Stonington
- Computer Repair, Stonington
- Computer Software & Services, Stonington
- Computer Software Service, Stonington
- Computer System Consultants, Stonington - IT Consulting Services
- Computer System Designers & Consultants, Stonington
- Condominiums & Townhomes for Rent, Stonington - Townhouses & Condos for Rent & Lease
- Congregational Church, Stonington
- Construction, Stonington
- Construction Services, Stonington
- Consultants & Services, Stonington
- Convention & Meeting Facilities, Stonington - Meeting Rooms
- Cooking, Food & Beverage Equipment, Stonington
- Counseling Services, Stonington
- Country Clubs, Stonington
- Cushions Retail, Stonington
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