- Cable Conduit & Pole Contractors, Melville
- Cable TV Companies & Services, Melville
- Cafe Restaurants, Melville
- Candy, Nut & Confectionery Wholesale & Retail, Melville - Candy Stores
- Carpenters, Melville - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Melville
- Carpet, Rug & Linoleum Flooring Dealers, Melville
- Cars, Truck, Van & SUV Car Dealerships, Melville - Auto Dealers
- Casual Dining Restaurants, Melville
- Caterers Food Services, Melville
- Catholic Churches, Melville
- Cellular & Mobile Phone Service, Melville
- Central American Restaurants, Melville
- Chambers Of Commerce, Melville
- Charitable & Non-Profit Organizations, Melville
- Child Care & Day Care Services, Melville
- Chinese Restaurants, Melville
- Christian Churches, Melville
- Churches 1 Of 3, Melville
- Churches 2 Of 3, Melville
- Churches 3 Of 3, Melville
- City & County Government, Melville
- City & County Law Enforcement, Melville
- Cleaning & Maintenance Services, Melville
- Cleaning & Restoration Contractors, Including Sandblasting, Melville
- Clergy, Melville
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- Clinics, Melville
- Clothing Stores, Melville - Clothes & Accessories
- Coating Engraving & Allied Services Manufacturing, Melville
- Coffee, Espresso & Tea House Restaurants, Melville
- Colleges & Universities, Melville
- Commercial Equipment, Melville
- Commercial Printing Manufacturers, Melville
- Communications Cable Contractors, Melville
- Communications Services, Melville
- Community & Recreational Facilities, Melville
- Community Services, Melville
- Computer & Audio Visual Services, Melville
- Computer & Software Stores, Melville
- Computer Stores, Melville
- Computer Stores - Other, Melville
- Construction, Melville
- Consultants & Services, Melville
- Contact Lenses, Melville
- Convenience Stores, Melville
- Convention & Meeting Facilities, Melville - Meeting Rooms
- Cooling System & Parts, Melville - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- County Police, Melville
- Credit Unions, Melville
- Crime Prevention Services, Melville
- Custom Sewing & Alterations, Melville
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