- Campgrounds, Wyandanch
- Candy, Nut & Confectionery Wholesale & Retail, Wyandanch - Candy Stores
- Caribbean Restaurants, Wyandanch
- Carpenters, Wyandanch - Carpentry Contractors
- Casual Dining Restaurants, Wyandanch
- Caterers Food Services, Wyandanch
- Central American Restaurants, Wyandanch
- Charitable & Non-Profit Organizations, Wyandanch
- Check Cashing Services, Wyandanch
- Chicken Restaurants, Wyandanch
- Child Care & Day Care Services, Wyandanch
- Chinese Restaurants, Wyandanch
- Church Of God, Wyandanch
- Church Of The Nazarene, Wyandanch
- Churches 1 Of 3, Wyandanch
- Churches 2 Of 3, Wyandanch
- Churches 3 Of 3, Wyandanch
- Churches Seventh Day Adventist, Wyandanch
- City & County Administrative Agencies, Wyandanch
- City & County Government, Wyandanch
- Cleaning & Maintenance Services, Wyandanch
- Cleaning & Restoration Contractors, Including Sandblasting, Wyandanch
- Clinics, Wyandanch
- Clowns, Wyandanch
- CNC Machine Shop, Wyandanch
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- Commercial & Industrial Laundry, Wyandanch
- Commercial Art & Graphic Design, Wyandanch
- Commercial Equipment, Wyandanch
- Commercial Printing Manufacturers, Wyandanch
- Communications Consultants, Wyandanch
- Community Church, Wyandanch
- Community Churches, Wyandanch
- Community Services, Wyandanch
- Computer & Audio Visual Services, Wyandanch
- Computer & Laptop Repair, Wyandanch - PC Repair Services
- Computer Repair, Wyandanch
- Computer Services, Wyandanch
- Computer System Consultants, Wyandanch - IT Consulting Services
- Computer System Designers & Consultants, Wyandanch
- Concrete, Wyandanch - Cement & Concrete Products, Suppliers, Companies
- Concrete & Pumice Bricks, Wyandanch
- Concrete Contractors, Wyandanch - Concrete Construction & Concrete Companies
- Condiments & Sauces, Wyandanch
- Cone & Wafer Products Manufacturers, Wyandanch
- Construction, Wyandanch
- Construction Services, Wyandanch
- Consultants & Services, Wyandanch
- Cooking, Food & Beverage Equipment, Wyandanch
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Wyandanch
- Cranes & Derricks, Wyandanch
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