- Cable TV Companies & Services, Southold
- Cafe Restaurants, Southold
- Camper, Rvs & Travel Trailer Dealers, Southold
- Candy, Nut & Confectionery Wholesale & Retail, Southold - Candy Stores
- Canoe & Kayak Rental, Southold
- Canoes & Kayaks, Southold - Equipment, Gear, PFD, Paddles & Accessories
- Car Rental, Southold - Rental Cars & Lease Service
- Carpenters, Southold - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Southold
- Carpet, Rug & Linoleum Flooring Dealers, Southold
- Cars, Truck, Van & SUV Car Dealerships, Southold - Auto Dealers
- Casual Dining Restaurants, Southold
- Caterers Food Services, Southold
- Catholic Churches, Southold
- Chambers Of Commerce, Southold
- Child Care & Day Care Services, Southold
- Children's Clothing Stores, Southold - Infant, Babies & Kids Clothing
- Chinese Restaurants, Southold
- Chiropractor, Southold
- Christmas Decorations & Lights, Southold
- Christmas Trees & Wreaths Retail, Southold
- Churches 1 Of 3, Southold
- City & County Administrative Agencies, Southold
- City & County Government, Southold
- Cleaning & Maintenance Services, Southold
- Cleaning & Restoration Contractors, Including Sandblasting, Southold
- Clinics, Southold
- CNC Machine Shop, Southold
- Coffee, Southold
- Coffee & Tea Stores, Southold
- Coffee, Espresso & Tea House Restaurants, Southold
- Collectibles, Southold
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- Commercial Equipment, Southold
- Commercial Printing Manufacturers, Southold
- Commercial, Industrial & Office Space for Rent & Lease, Southold
- Commodity & Merchandise Storage & Warehouse, Southold - Warehousing
- Communications Services, Southold
- Community & Recreational Facilities, Southold
- Community Services, Southold
- Computer & Audio Visual Services, Southold
- Computer & Software Stores, Southold
- Computer Repair, Southold
- Computer Software & Services, Southold
- Computer Software Service, Southold
- Computer System Consultants, Southold - IT Consulting Services
- Computer System Designers & Consultants, Southold
- Concrete Contractors, Southold - Concrete Construction & Concrete Companies
- Concrete Supplies & Equipment, Southold - Concrete Grinder, Concrete Pumping, Cement Mixer, etc
- Condiments & Sauces, Southold
- Condominiums & Townhomes for Rent, Southold - Townhouses & Condos for Rent & Lease
- Construction, Southold
- Construction Companies, Southold
- Construction Equipment Rental & Leasing, Southold
- Construction Services, Southold
- Consultants & Services, Southold
- Contractor Equipment & Supplies, Southold - Construction Equipment & Machinery
- Convenience Stores, Southold
- Cooling System & Parts, Southold - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copying & Duplicating Services, Southold
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Southold
- Counseling Professionals, Southold
- Country Cooking Restaurants, Southold
- Cremation Services, Supplies & Equipment, Southold
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