- Cabinets & Cabinet Hardware, Yaphank
- Cabinets Refacing, Refinishing & Building, Yaphank - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Carpet Rug & Upholstery Cleaners, Yaphank
- Casual Dining Restaurants, Yaphank
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Yaphank
- Cellular & Mobile Phone Service, Yaphank
- Charitable & Non-Profit Organizations, Yaphank
- Chemical Product Manufacturers, Yaphank
- Child Care & Day Care Services, Yaphank
- City & County Administrative Agencies, Yaphank
- City & County Government, Yaphank
- City & County Law Enforcement, Yaphank
- Cleaning & Maintenance Services, Yaphank
- Cleaning & Restoration Contractors, Including Sandblasting, Yaphank
- Clinics, Yaphank
- CNC Machine Shop, Yaphank
- Coating Engraving & Allied Services Manufacturing, Yaphank
- Coffee, Yaphank
- Coffee, Espresso & Tea House Restaurants, Yaphank
- Colleges & Universities, Yaphank
- Commercial Equipment, Yaphank
- Commercial Printing, Yaphank
- Commercial Printing Manufacturers, Yaphank
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- Commercial, Industrial & Office Space for Rent & Lease, Yaphank
- Commodity & Merchandise Storage & Warehouse, Yaphank - Warehousing
- Communications Services, Yaphank
- Community & Recreational Facilities, Yaphank
- Community Services, Yaphank
- Computer & Laptop Repair, Yaphank - PC Repair Services
- Computer & Software Stores, Yaphank
- Computer Networks, Yaphank - Design & Systems
- Computer Repair, Yaphank
- Computer Stores, Yaphank
- Concrete, Yaphank - Cement & Concrete Products, Suppliers, Companies
- Concrete Contractors, Yaphank - Concrete Construction & Concrete Companies
- Concrete Handling Services, Yaphank - Concrete Pumping
- Condominiums & Townhomes for Rent, Yaphank - Townhouses & Condos for Rent & Lease
- Construction, Yaphank
- Construction Estimators, Yaphank
- Construction Services, Yaphank
- Consultants & Services, Yaphank
- Control Systems & Regulators, Yaphank
- Convenience Stores, Yaphank
- Convents & Monasteries, Yaphank
- Copying & Duplicating Services, Yaphank
- County Police, Yaphank
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