- Cabinets & Cabinet Hardware, Port Washington
- Cabinets Refacing, Refinishing & Building, Port Washington - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cafe Restaurants, Port Washington
- Campus Ministries, Port Washington
- Car Detailing & Wash Service, Port Washington - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Port Washington
- Carpenters, Port Washington - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Port Washington
- Casual Dining Restaurants, Port Washington
- Catholic Churches, Port Washington
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Port Washington
- Cellular & Mobile Phone Service, Port Washington
- Charitable & Non-Profit Organizations, Port Washington
- Child Care & Day Care Services, Port Washington
- Child Related Social Services, Port Washington
- Chimney & Fireplace Construction Contractors, Port Washington - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Port Washington - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Port Washington
- Chiropractic Clinics, Port Washington
- Chiropractor, Port Washington
- Church Of Jesus Christ Of Latter Day Saints, Port Washington
- Churches 1 Of 3, Port Washington
- Churches 2 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
- Clothing Stores, Port Washington - Clothes & Accessories
- Cocktail Lounges, Port Washington
- Coffee, Espresso & Tea House Restaurants, Port Washington
- Colleges & Universities, Port Washington
- Commercial Equipment, Port Washington
- Commercial Printing, Port Washington
- Commercial Printing Manufacturers, Port Washington
- Communications Services, Port Washington
- Community & Recreational Facilities, Port Washington
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- Community Services, Port Washington
- Computer & Audio Visual Services, Port Washington
- Computer & Laptop Repair, Port Washington - PC Repair Services
- Computer & Software Stores, Port Washington
- Computer Repair, Port Washington
- Computer System Consultants, Port Washington - IT Consulting Services
- Computer System Designers & Consultants, Port Washington
- Concrete, Port Washington - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Port Washington
- Concrete Construction Forms & Accessories, Port Washington
- Concrete Contractors, Port Washington - Concrete Construction & Concrete Companies
- Concrete Curing & Treating Materials, Port Washington
- Concrete Product Manufacturers, Port Washington
- Concrete Reinforcement, Port Washington - Reinforced Concrete
- Condiments & Sauces, Port Washington
- Congregational Church, Port Washington
- Construction, Port Washington
- Consultants & Services, Port Washington
- Contractors Equipment & Supplies - Rental & Leasing, Port Washington
- Convenience Stores, Port Washington
- Convention & Meeting Facilities, Port Washington - Meeting Rooms
- Convention Services - Other, Port Washington
- Cooking, Food & Beverage Equipment, Port Washington
- Cooling System & Parts, Port Washington - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copying & Duplicating Services, Port Washington
- Copyright, Patent & Trademark Attorneys & Lawyers, Port Washington
- Copyright, Patent & Trademark Attorneys & Lawyers, Port Washington
- Copyright, Patent & Trademark Lawyers & Attorneys, Port Washington
- Corporate Attorneys & Lawyers, Port Washington
- Corporate Business Attorneys & Lawyers, Port Washington
- Corporate Lawyers & Attorneys, Port Washington
- Counseling Services, Port Washington
- Country Cooking Restaurants, Port Washington
- Cremation Services, Supplies & Equipment, Port Washington
- Critical & Emergency Care Doctors, Port Washington - Intensive Care Doctors, Physicians & Surgeons
- Curtain & Blanket Cleaners, Port Washington
- Custom Parts & Accessories, Port Washington
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