- Cable TV Companies & Services, East Islip
- Cafe Restaurants, East Islip
- Car Detailing & Wash Service, East Islip - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, East Islip
- Carpet Rug & Upholstery Cleaners, East Islip
- Cars, Truck, Van & SUV Car Dealerships, East Islip - Auto Dealers
- Casual Dining Restaurants, East Islip
- Caterers Food Services, East Islip
- Catholic Churches, East Islip
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, East Islip
- Cellular & Mobile Phone Service, East Islip
- Chicken Restaurants, East Islip
- Child Care & Day Care Services, East Islip
- Chiropractor, East Islip
- Christian Churches, East Islip
- Churches 2 Of 3, East Islip
- City & County Administrative Agencies, East Islip
- City & County Government, East Islip
- Cleaning & Maintenance Services, East Islip
- Clinics, East Islip
- Clock Repair, East Islip
- Clothing Stores, East Islip - Clothes & Accessories
- Cocktail Lounges, East Islip
- Coffee, East Islip
- Coffee, Espresso & Tea House Restaurants, East Islip
- Coin Dealers & Supplies , East Islip
- Collectibles, East Islip
- Colleges & Universities, East Islip
- Commercial Equipment, East Islip
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- Commercial Printing, East Islip
- Commercial Printing Manufacturers, East Islip
- Communications Services, East Islip
- Community & Recreational Facilities, East Islip
- Community Services, East Islip
- Computer & Laptop Repair, East Islip - PC Repair Services
- Computer & Software Stores, East Islip
- Computer Networks, East Islip - Design & Systems
- Computer Repair, East Islip
- Computer Software & Services, East Islip
- Computer Software Service, East Islip
- Concrete Contractors, East Islip - Concrete Construction & Concrete Companies
- Concrete Supplies & Equipment, East Islip - Concrete Grinder, Concrete Pumping, Cement Mixer, etc
- Construction, East Islip
- Construction Companies, East Islip
- Construction Equipment Rental & Leasing, East Islip
- Construction Services, East Islip
- Consultants & Services, East Islip
- Consumer Purchasing Services, East Islip
- Contact Lenses, East Islip
- Contest Judging & Arranging, East Islip
- Convenience Stores, East Islip
- Convention & Meeting Facilities, East Islip - Meeting Rooms
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, East Islip
- Counseling Professionals, East Islip
- Cruise Agents, East Islip - Travel Agents
- Cruise Lines, East Islip - Cruises
- Curtain & Blanket Cleaners, East Islip
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