- Cabinets & Cabinet Hardware, Sayville
- Cabinets Refacing, Refinishing & Building, Sayville - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cabinets Refinishing, Refacing & Resurfacing, Sayville - Kitchen & Custom Cabinets
- Cabins Cottages & Chalet Rental, Sayville
- Cable TV Companies & Services, Sayville
- Cafe Restaurants, Sayville
- Candle Manufacturers Equipment & Supplies, Sayville
- Candy, Nut & Confectionery Wholesale & Retail, Sayville - Candy Stores
- Caning Furniture, Sayville
- Car Rental, Sayville - Rental Cars & Lease Service
- Carpet Rug & Upholstery Cleaners, Sayville
- Carpet, Rug & Linoleum Flooring Dealers, Sayville
- Cars, Truck, Van & SUV Car Dealerships, Sayville - Auto Dealers
- Casual Dining Restaurants, Sayville
- Caterers Food Services, Sayville
- Catholic Churches, Sayville
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Sayville
- Cellular & Mobile Phone Service, Sayville
- Central American Restaurants, Sayville
- Chambers Of Commerce, Sayville
- Charitable & Non-Profit Organizations, Sayville
- Chemicals & Related Products, Sayville
- Child Care & Day Care Services, Sayville
- Child Related Social Services, Sayville
- Children's Clothing Stores, Sayville - Infant, Babies & Kids Clothing
- Chimney Cleaning & Repair, Sayville - Fireplace - Chimney Sweep Services
- Chimneys & Chimney Supplies, Sayville
- Chinese Restaurants, Sayville
- Chiropractor, Sayville
- Churches 1 Of 3, Sayville
- Churches 2 Of 3, Sayville
- City & County Administrative Agencies, Sayville
- City & County Government, Sayville
- Cleaning & Maintenance Services, Sayville
- Cleaning & Restoration Contractors, Including Sandblasting, Sayville
- Cleaning Chemical Compounds, Sayville
- Cleaning Waxes, Sayville
- Clinics, Sayville
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- Clothing Stores, Sayville - Clothes & Accessories
- Coffee, Sayville
- Coffee, Espresso & Tea House Restaurants, Sayville
- Comedy Clubs & Dance Clubs, Sayville
- Commercial & Industrial Laundry, Sayville
- Commercial & Industrial Photographers, Sayville
- Commercial & Literacy Writings, Sayville
- Commercial Printing Manufacturers, Sayville
- Communications Consultants, Sayville
- Communications Services, Sayville
- Community & Recreational Facilities, Sayville
- Community Church, Sayville
- Community Churches, Sayville
- Community Services, Sayville
- Computer & Software Stores, Sayville
- Computer Repair, Sayville
- Computer Software & Services, Sayville
- Computer Software Service, Sayville
- Congregational Church, Sayville
- Construction, Sayville
- Construction Companies, Sayville
- Construction Services, Sayville
- Consultants & Services, Sayville
- Contractor Equipment & Supplies, Sayville - Construction Equipment & Machinery
- Convenience Stores, Sayville
- Cooking Oils & Shortenings, Sayville
- Cooling System & Parts, Sayville - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copying & Duplicating Services, Sayville
- Corporate Attorneys & Lawyers, Sayville
- Corporate Lawyers & Attorneys, Sayville
- Cosmetics, Sayville
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Sayville
- Counseling Professionals, Sayville
- Court Reporter , Sayville - Stenographer & Convention Reporters
- Credit Unions, Sayville
- Cruise Agents, Sayville - Travel Agents
- Cruise Lines, Sayville - Cruises
- Custom Sewing & Alterations, Sayville
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