- Cabinets & Cabinet Hardware, Holtsville
- Cabinets Refacing, Refinishing & Building, Holtsville - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cable TV Companies & Services, Holtsville
- Carpet Rug & Upholstery Cleaners, Holtsville
- Cars, Truck, Van & SUV Car Dealerships, Holtsville - Auto Dealers
- Casual Dining Restaurants, Holtsville
- Caterers Food Services, Holtsville
- Ceiling Contractors, Holtsville - Ceilings
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Holtsville
- Cellular & Mobile Phone Service, Holtsville
- Central American Restaurants, Holtsville
- Chemical Manufacturers, Holtsville
- Chemical Cleaning, Holtsville
- Chemical Product Manufacturers, Holtsville
- Child Care & Day Care Services, Holtsville
- Child Related Social Services, Holtsville
- Chinese Restaurants, Holtsville
- Chiropractor, Holtsville
- Christmas Decorations & Lights, Holtsville
- Churches 1 Of 3, Holtsville
- Citizen Band Radio, Holtsville
- City & County Government, Holtsville
- Cleaning & Maintenance Services, Holtsville
- Coffee, Holtsville
- Coffee, Espresso & Tea House Restaurants, Holtsville
- Comic Book Stores, Holtsville
- Commercial Equipment, Holtsville
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- Communications Services, Holtsville
- Community Services, Holtsville
- Computer & Software Stores, Holtsville
- Computer Repair, Holtsville
- Computer Software & Services, Holtsville
- Computer Software Service, Holtsville
- Concrete, Holtsville - Cement & Concrete Products, Suppliers, Companies
- Concrete Construction Forms & Accessories, Holtsville
- Concrete Contractors, Holtsville - Concrete Construction & Concrete Companies
- Concrete Reinforcement, Holtsville - Reinforced Concrete
- Construction, Holtsville
- Construction Estimators, Holtsville
- Construction Machinery, Holtsville - Mining Machinery
- Construction Services, Holtsville
- Consultants & Services, Holtsville
- Consumer Electronics, Holtsville
- Contractor Equipment & Supplies, Holtsville - Construction Equipment & Machinery
- Contractors Equipment & Supplies - Rental & Leasing, Holtsville
- Convalescent Homes Placement Services, Holtsville - Convalescent Care
- Convenience Stores, Holtsville
- Cooking, Food & Beverage Equipment, Holtsville
- Cookware & Cooking Utensils Stores, Holtsville
- Cosmetics, Holtsville
- Credit Card Plan Services, Holtsville
- Curtain & Blanket Cleaners, Holtsville
- Curtains, Drapes & Window Treatments and Coverings, Holtsville - Drapery & Upholstery Fabric Stores
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