- Cabinets & Cabinet Hardware, Locust Valley
- Cabinets Refacing, Refinishing & Building, Locust Valley - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cable TV Companies & Services, Locust Valley
- Cafe Restaurants, Locust Valley
- Candy, Nut & Confectionery Wholesale & Retail, Locust Valley - Candy Stores
- Carpet Rug & Upholstery Cleaners, Locust Valley
- Carpet, Rug & Linoleum Flooring Dealers, Locust Valley
- Casual Dining Restaurants, Locust Valley
- Caterers Food Services, Locust Valley
- Cemeteries & Crematories, Locust Valley
- Central American Restaurants, Locust Valley
- Cheese Products, Locust Valley - Cheese Shops
- Child Care & Day Care Services, Locust Valley
- Child Related Social Services, Locust Valley
- Chimney & Fireplace Construction Contractors, Locust Valley - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Locust Valley - Fireplace - Chimney Sweep Services
- Chiropractor, Locust Valley
- Christian Churches, Locust Valley
- Churches 1 Of 3, Locust Valley
- City & County Administrative Agencies, Locust Valley
- City & County Government, Locust Valley
- Cleaning & Maintenance Services, Locust Valley
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- Clothing Stores, Locust Valley - Clothes & Accessories
- Commercial, Industrial & Office Space for Rent & Lease, Locust Valley
- Communications Services, Locust Valley
- Community & Recreational Facilities, Locust Valley
- Community Services, Locust Valley
- Computer & Audio Visual Services, Locust Valley
- Computer & Software Stores, Locust Valley
- Computer Aided Design Systems & Services, Locust Valley - CAD
- Computer Repair, Locust Valley
- Computer Software & Services, Locust Valley
- Computer Software Service, Locust Valley
- Computer System Consultants, Locust Valley - IT Consulting Services
- Computer System Designer & Consultant, Locust Valley
- Computer System Designers & Consultants, Locust Valley
- Condiments & Sauces, Locust Valley
- Construction, Locust Valley
- Construction Services, Locust Valley
- Consultants & Services, Locust Valley
- Convents & Monasteries, Locust Valley
- Costume Sales & Rental, Locust Valley
- Custom Sewing & Alterations, Locust Valley
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