- Cafe Restaurants, Mattituck
- Candy, Nut & Confectionery Wholesale & Retail, Mattituck - Candy Stores
- Car Detailing & Wash Service, Mattituck - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Mattituck
- Carpenters, Mattituck - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Mattituck
- Carpet, Rug & Linoleum Flooring Dealers, Mattituck
- Casual Dining Restaurants, Mattituck
- Caterers Food Services, Mattituck
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Mattituck
- Cellular & Mobile Phone Service, Mattituck
- Cheese Products, Mattituck - Cheese Shops
- Chemical Products, Mattituck - Chemical Distributors, Dealers, Wholesale, etc
- Chinese Restaurants, Mattituck
- Chiropractor, Mattituck
- Christian Churches, Mattituck
- Christmas Trees & Wreaths Retail, Mattituck
- Church Of Christ, Mattituck
- Churches 1 Of 3, Mattituck
- City & County Administrative Agencies, Mattituck
- City & County Government, Mattituck
- Cleaning & Maintenance Services, Mattituck
- Cleaning Supplies, Systems & Equipment, Mattituck - Janitorial Supplies
- Clinics, Mattituck
- Clothing Stores, Mattituck - Clothes & Accessories
- CNC Machine Shop, Mattituck
- Coffee & Tea Stores, Mattituck
- Coffee, Espresso & Tea House Restaurants, Mattituck
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- Colleges & Universities, Mattituck
- Communications Consultants, Mattituck
- Communications Services, Mattituck
- Community & Recreational Facilities, Mattituck
- Community Services, Mattituck
- Computer & Audio Visual Services, Mattituck
- Computer & Laptop Repair, Mattituck - PC Repair Services
- Computer & Software Stores, Mattituck
- Computer Networks, Mattituck - Design & Systems
- Computer Repair, Mattituck
- Computer Software & Services, Mattituck
- Computer Software Service, Mattituck
- Computer System Consultants, Mattituck - IT Consulting Services
- Computer System Designers & Consultants, Mattituck
- Concrete Contractors, Mattituck - Concrete Construction & Concrete Companies
- Construction, Mattituck
- Construction Equipment Rental & Leasing, Mattituck
- Construction Services, Mattituck
- Consultants & Services, Mattituck
- Convenience Stores, Mattituck
- Copying & Duplicating Services, Mattituck
- Country Clubs, Mattituck
- Cremation Services, Supplies & Equipment, Mattituck
- Criminal Attorneys & Lawyers, Mattituck
- Criminal Defense Attorneys & Lawyers, Mattituck
- Criminal Defense Lawyers & Attorneys, Mattituck
- Crushed Stone & Rock, Mattituck - Crushed Granite, Concrete, Gravel, etc
- Custom Sewing & Alterations, Mattituck
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