- Cabinets & Cabinet Hardware, Port Washington
- Cabinets Refacing, Refinishing & Building, Port Washington - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cabinets Refinishing, Refacing & Resurfacing, Port Washington - Kitchen & Custom Cabinets
- Cafe Restaurants, Port Washington
- Cameras & Photographic Supplies, Port Washington
- Campgrounds, Port Washington
- Candy, Nut & Confectionery Wholesale & Retail, Port Washington - Candy Stores
- Car Alarms & Security Systems, Port Washington - Remote Car Starter, etc
- Car Detailing & Wash Service, Port Washington - Auto Detailing
- Car Rental, Port Washington - Rental Cars & Lease Service
- Car Wash, Cleaning, Wax & Polish Service, Port Washington
- Carbon & Graphite Products Manufacturers, Port Washington
- Carpenters, Port Washington - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Port Washington
- Carpet, Rug & Linoleum Flooring Dealers, Port Washington
- Cars, Truck, Van & SUV Car Dealerships, Port Washington - Auto Dealers
- Caskets Burial, Port Washington
- Casual Dining Restaurants, Port Washington
- Catalog, Mail-Order & Electronic Shopping, Port Washington
- Caterers Food Services, Port Washington
- Catholic Churches, Port Washington
- Ceiling & Electric Fans, Port Washington
- Cell & Mobile Installation Repairs, Port Washington
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Port Washington
- Cellular & Mobile Phone Service, Port Washington
- Central American Restaurants, Port Washington
- Chambers Of Commerce, Port Washington
- Charitable & Non-Profit Organizations, Port Washington
- Chemical Product Manufacturers, Port Washington
- Chemical Products, Port Washington - Chemical Distributors, Dealers, Wholesale, etc
- Chicken Restaurants, Port Washington
- Child Care & Day Care Services, Port Washington
- Child Related Social Services, Port Washington
- Childrens After School Programs, Port Washington
- Chinese Restaurants, Port Washington
- Chiropractor, Port Washington
- Christian Churches, Port Washington
- Church Of Christ, Port Washington
- Churches 1 Of 3, Port Washington
- Churches 2 Of 3, Port Washington
- Churches 3 Of 3, Port Washington
- Cigar, Cigarette & Tobacco Store & Supplies, Port Washington
- City & County Administrative Agencies, Port Washington
- City & County Government, Port Washington
- City & County Law Enforcement, Port Washington
- Cleaning & Maintenance Services, Port Washington
- Clinics, Port Washington
- Closet Designing & Remodeling, Port Washington - Custom Closets
- Clothing Stores, Port Washington - Clothes & Accessories
- CNC Machine Shop, Port Washington
- Coating Engraving & Allied Services Manufacturing, Port Washington
- Cocktail Lounges, Port Washington
- Coffee, Port Washington
- Coffee & Tea Stores, Port Washington
- Coffee, Espresso & Tea House Restaurants, Port Washington
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- Cold Type Composition, Port Washington
- Collection Agency Services, Port Washington
- Commercial & Industrial Laundry, Port Washington
- Commercial & Industrial Photographers, Port Washington
- Commercial & Literacy Writings, Port Washington
- Commercial Equipment, Port Washington
- Commercial Printing, Port Washington
- Commercial Printing Manufacturers, Port Washington
- Commercial Writing Services, Port Washington
- Commercial, Industrial & Office Space for Rent & Lease, Port Washington
- Communication Equipment & Systems, Port Washington
- Communications Services, Port Washington
- Community & Recreational Facilities, Port Washington
- Community Services, Port Washington
- Computer & Audio Visual Services, Port Washington
- Computer & Laptop Repair, Port Washington - PC Repair Services
- Computer & Software Stores, Port Washington
- Computer Networks, Port Washington - Design & Systems
- Computer Repair, Port Washington
- Computer Services, Port Washington
- Computer Software & Services, Port Washington
- Computer Software Service, Port Washington
- Computer Stores, Port Washington
- Computer System Consultants, Port Washington - IT Consulting Services
- Computer System Designers & Consultants, Port Washington
- Concrete Contractors, Port Washington - Concrete Construction & Concrete Companies
- Concrete Supplies & Equipment, Port Washington - Concrete Grinder, Concrete Pumping, Cement Mixer, etc
- Condiments & Sauces, Port Washington
- Condominiums & Townhomes for Rent, Port Washington - Townhouses & Condos for Rent & Lease
- Construction, Port Washington
- Construction & Civil Engineer, Port Washington
- Construction Companies, Port Washington
- Construction Services, Port Washington
- Consultants & Services, Port Washington
- Consumer Purchasing Services, Port Washington
- Contractors Supplies & Equipment, Port Washington
- Convenience Stores, Port Washington
- Copying & Duplicating Services, Port Washington
- Cosmetics, Port Washington
- Cosmetics & Perfumes Outlets, Port Washington
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Port Washington
- Counseling Services, Port Washington
- Country Clubs, Port Washington
- County Police, Port Washington
- Court Reporter , Port Washington - Stenographer & Convention Reporters
- Coverall Supplies & Services, Port Washington
- Craft Supplies, Port Washington - Hobby & Craft Stores
- Credit Card & Plans - Machines, Equipment & Supplies , Port Washington - Terminal Systems
- Credit Card Merchant Services, Port Washington
- Credit Card Plan Services, Port Washington
- Credit Unions, Port Washington
- Curtains, Drapes & Window Treatments and Coverings, Port Washington - Drapery & Upholstery Fabric Stores
- Custom Clothing, Port Washington
- Custom Printed T-Shirts, Port Washington
- Custom Sewing & Alterations, Port Washington
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