- Cabinets & Cabinet Hardware, Smithtown
- Cabinets Refacing, Refinishing & Building, Smithtown - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cafe Restaurants, Smithtown
- Candy, Nut & Confectionery Wholesale & Retail, Smithtown - Candy Stores
- Car Detailing & Wash Service, Smithtown - Auto Detailing
- Car Rental, Smithtown - Rental Cars & Lease Service
- Car Wash, Cleaning, Wax & Polish Service, Smithtown
- Cardiologists, Smithtown - Heart Doctors, Physicians & Surgeons (Cardiology)
- Carpenters, Smithtown - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Smithtown
- Carpet, Rug & Linoleum Flooring Dealers, Smithtown
- Cars, Truck, Van & SUV Car Dealerships, Smithtown - Auto Dealers
- Casual Dining Restaurants, Smithtown
- Catalog, Mail-Order & Electronic Shopping, Smithtown
- Caterers Food Services, Smithtown
- Catholic Churches, Smithtown
- Ceiling Contractors, Smithtown - Ceilings
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Smithtown
- Cellular & Mobile Phone Service, Smithtown
- Central American Restaurants, Smithtown
- Ceramic Tile, Smithtown - Wholesale, Manufacturers & Suppliers
- Chambers Of Commerce, Smithtown
- Charitable & Non-Profit Organizations, Smithtown
- Child Care & Day Care Services, Smithtown
- Child Related Social Services, Smithtown
- Children's Clothing Stores, Smithtown - Infant, Babies & Kids Clothing
- Childrens After School Programs, Smithtown
- Chimney & Fireplace Construction Contractors, Smithtown - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Smithtown - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Smithtown
- Chiropractor, Smithtown
- Churches 1 Of 3, Smithtown
- Churches 2 Of 3, Smithtown
- Cigar, Cigarette & Tobacco Store & Supplies, Smithtown
- City & County Administrative Agencies, Smithtown
- City & County Government, Smithtown
- Cleaning & Maintenance Services, Smithtown
- Cleaning & Restoration Contractors, Including Sandblasting, Smithtown
- Clinics, Smithtown
- Clothing Stores, Smithtown - Clothes & Accessories
- Coaching Business & Personal, Smithtown
- Coffee, Smithtown
- Coffee, Espresso & Tea House Restaurants, Smithtown
- Coin Dealers & Supplies , Smithtown
- Coin Operated Machines & Equipment, Smithtown
- Collectibles, Smithtown
- Collection Agency Services, Smithtown
- Comic Book Stores, Smithtown
- Commercial & Industrial Laundry, Smithtown
- Commercial & Industrial Photographers, Smithtown
- Commercial Equipment, Smithtown
- Commercial Paper, Smithtown
- Commercial Physical Research, Smithtown
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- Commercial Printing Manufacturers, Smithtown
- Communication Equipment & Systems, Smithtown
- Communications Consultants, Smithtown
- Communications Services, Smithtown
- Community & Recreational Facilities, Smithtown
- Community Services, Smithtown
- Computer & Audio Visual Services, Smithtown
- Computer & Laptop Repair, Smithtown - PC Repair Services
- Computer & Software Stores, Smithtown
- Computer Cable & Wire Installation, Smithtown
- Computer Manufacturers, Smithtown
- Computer Networks, Smithtown - Design & Systems
- Computer Repair, Smithtown
- Computer Room - Installation & Equipment, Smithtown
- Computer Software & Services, Smithtown
- Computer Software Service, Smithtown
- Computer Stores, Smithtown
- Computer System Consultants, Smithtown - IT Consulting Services
- Computer System Designer & Consultant, Smithtown
- Concrete, Smithtown - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Smithtown
- Concrete Additives, Smithtown
- Concrete Contractors, Smithtown - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Smithtown
- Condiments & Sauces, Smithtown
- Construction, Smithtown
- Construction & Civil Engineer, Smithtown
- Construction Estimators, Smithtown
- Construction Services, Smithtown
- Consultants & Services, Smithtown
- Consulting Services, Smithtown - Internet Consultants
- Contractors Supplies & Equipment, Smithtown
- Convalescent Homes Placement Services, Smithtown - Convalescent Care
- Convenience Stores, Smithtown
- Copier & Copy Machine Sales, Supplies, Service & Repair, Smithtown
- Copier & Copy Machine Supplies, Equipment & Parts, Smithtown
- Copying & Duplicating Services, Smithtown
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Smithtown
- Counseling Services, Smithtown
- Country Clubs, Smithtown
- Craft Supplies, Smithtown - Hobby & Craft Stores
- Cranes & Derricks, Smithtown
- Credit & Debt Counseling Services, Smithtown
- Credit Card & Plans - Machines, Equipment & Supplies , Smithtown - Terminal Systems
- Credit Restoration Service, Smithtown
- Cremation Services, Supplies & Equipment, Smithtown
- Criminal Attorneys & Lawyers, Smithtown
- Criminal Defense Attorneys & Lawyers, Smithtown
- Criminal Defense Lawyers & Attorneys, Smithtown
- Critical & Emergency Care Doctors, Smithtown - Intensive Care Doctors, Physicians & Surgeons
- Cruise Agents, Smithtown - Travel Agents
- Cruise Lines, Smithtown - Cruises
- Custom Sewing & Alterations, Smithtown
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