- Cable TV Companies & Services, Islip
- Carpet Rug & Upholstery Cleaners, Islip
- Cars, Truck, Van & SUV Car Dealerships, Islip - Auto Dealers
- Casual Dining Restaurants, Islip
- Caterers Food Services, Islip
- Central American Restaurants, Islip
- Charitable & Non-Profit Organizations, Islip
- Chicken Restaurants, Islip
- Child Care & Day Care Services, Islip
- Child Related Social Services, Islip
- Children's Clothing Stores, Islip - Infant, Babies & Kids Clothing
- Childrens After School Programs, Islip
- Chiropractic Clinics, Islip
- Chiropractor, Islip
- Churches 1 Of 3, Islip
- Churches 2 Of 3, Islip
- City & County Government, Islip
- City & County Law Enforcement, Islip
- Cleaning & Maintenance Services, Islip
- Clinics, Islip
- Clothing Stores, Islip - Clothes & Accessories
- Coffee, Islip
- Coffee, Espresso & Tea House Restaurants, Islip
- Collectibles, Islip
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- Commercial & Industrial Laundry, Islip
- Commercial Printing Manufacturers, Islip
- Communications Services, Islip
- Community & Recreational Facilities, Islip
- Community Services, Islip
- Computer & Laptop Repair, Islip - PC Repair Services
- Computer & Software Stores, Islip
- Computer Networks, Islip - Design & Systems
- Computer Repair, Islip
- Computer Supplies, Parts, Equipments & Accessories, Islip
- Construction, Islip
- Construction Companies, Islip
- Construction Equipment & Supplies, Islip
- Construction Services, Islip
- Construction Surveyor, Islip
- Consultants & Services, Islip
- Convenience Stores, Islip
- Convents & Monasteries, Islip
- Country Cooking Restaurants, Islip
- County Police, Islip
- Court Reporter , Islip - Stenographer & Convention Reporters
- Cremation Services, Supplies & Equipment, Islip
- Custom Furniture, Islip - Furniture Designers & Custom Builders
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