- Cabinets & Cabinet Hardware, Port Jefferson Station
- Cabinets Refacing, Refinishing & Building, Port Jefferson Station - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cabins Cottages & Chalet Rental, Port Jefferson Station
- Cafe Restaurants, Port Jefferson Station
- Camping Supplies & Equipment Stores, Port Jefferson Station - Tents, Gear & Accessories
- Cancer Clinics, Port Jefferson Station - Cancer Treatment Centers
- Car Alarms & Security Systems, Port Jefferson Station - Remote Car Starter, etc
- Car Detailing & Wash Service, Port Jefferson Station - Auto Detailing
- Car Rental, Port Jefferson Station - Rental Cars & Lease Service
- Car Tune Up Service, Port Jefferson Station - Auto Tune Up
- Car Wash, Cleaning, Wax & Polish Service, Port Jefferson Station
- Card & Game Rooms & Services, Port Jefferson Station
- Cardiologists, Port Jefferson Station - Heart Doctors, Physicians & Surgeons (Cardiology)
- Cargo Containers, Port Jefferson Station - Freight Containers
- Carnival Services, Port Jefferson Station
- Carpenters, Port Jefferson Station - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Port Jefferson Station
- Carpet, Rug & Linoleum Flooring Dealers, Port Jefferson Station
- Cars, Truck, Van & SUV Car Dealerships, Port Jefferson Station - Auto Dealers
- Casual Dining Restaurants, Port Jefferson Station
- Catholic Churches, Port Jefferson Station
- Caulking Contractors, Port Jefferson Station
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Port Jefferson Station
- Cellular & Mobile Phone Service, Port Jefferson Station
- Central American Restaurants, Port Jefferson Station
- Chairs Rental, Port Jefferson Station
- Charitable & Non-Profit Organizations, Port Jefferson Station
- Check Cashing Services, Port Jefferson Station
- Chicken Restaurants, Port Jefferson Station
- Child Care & Day Care Services, Port Jefferson Station
- Child Related Social Services, Port Jefferson Station
- Chinese Restaurants, Port Jefferson Station
- Chiropractor, Port Jefferson Station
- Church Of Jesus Christ Of Latter Day Saints, Port Jefferson Station
- Churches 1 Of 3, Port Jefferson Station
- City & County Administrative Agencies, Port Jefferson Station
- City & County Government, Port Jefferson Station
- Cleaning & Maintenance Services, Port Jefferson Station
- Cleaning & Restoration Contractors, Including Sandblasting, Port Jefferson Station
- Cleaning Supplies, Systems & Equipment, Port Jefferson Station - Janitorial Supplies
- Clinics, Port Jefferson Station
- Clothing Stores, Port Jefferson Station - Clothes & Accessories
- CNC Machine Shop, Port Jefferson Station
- Coffee, Port Jefferson Station
- Coffee & Tea Stores, Port Jefferson Station
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- Coffee, Espresso & Tea House Restaurants, Port Jefferson Station
- Collection Agency Services, Port Jefferson Station
- Colleges & Universities, Port Jefferson Station
- Commercial & Industrial Laundry, Port Jefferson Station
- Commercial Equipment, Port Jefferson Station
- Commercial Printing, Port Jefferson Station
- Commercial Printing Manufacturers, Port Jefferson Station
- Commercial, Industrial & Office Space for Rent & Lease, Port Jefferson Station
- Communications Consultants, Port Jefferson Station
- Communications Services, Port Jefferson Station
- Community & Recreational Facilities, Port Jefferson Station
- Community Services, Port Jefferson Station
- Computer & Audio Visual Services, Port Jefferson Station
- Computer & Laptop Repair, Port Jefferson Station - PC Repair Services
- Computer & Software Stores, Port Jefferson Station
- Computer Networks, Port Jefferson Station - Design & Systems
- Computer Repair, Port Jefferson Station
- Computer Software & Services, Port Jefferson Station
- Computer Software Service, Port Jefferson Station
- Computer System Consultants, Port Jefferson Station - IT Consulting Services
- Computer System Designers & Consultants, Port Jefferson Station
- Computer Systems & Equipment Custom Designed, Port Jefferson Station
- Concrete Contractors, Port Jefferson Station - Concrete Construction & Concrete Companies
- Condiments & Sauces, Port Jefferson Station
- Condominiums & Townhomes for Rent, Port Jefferson Station - Townhouses & Condos for Rent & Lease
- Construction, Port Jefferson Station
- Construction Companies, Port Jefferson Station
- Construction Services, Port Jefferson Station
- Consultants & Services, Port Jefferson Station
- Contractor Equipment & Supplies, Port Jefferson Station - Construction Equipment & Machinery
- Convenience Stores, Port Jefferson Station
- Cooling System & Parts, Port Jefferson Station - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Cosmetics, Port Jefferson Station
- Counseling Services, Port Jefferson Station
- Coverall Supplies & Services, Port Jefferson Station
- Craft Supplies, Port Jefferson Station - Hobby & Craft Stores
- Credit & Debt Counseling Services, Port Jefferson Station
- Credit Card & Plans - Machines, Equipment & Supplies , Port Jefferson Station - Terminal Systems
- Credit Card Plan Services, Port Jefferson Station
- Credit Unions, Port Jefferson Station
- Cremation Services, Supplies & Equipment, Port Jefferson Station
- Critical & Emergency Care Doctors, Port Jefferson Station - Intensive Care Doctors, Physicians & Surgeons
- Custom Designed Replica Car Dealers, Port Jefferson Station - Auto Dealers
- Custom Parts & Accessories, Port Jefferson Station
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