- Cable TV Companies & Services, Northport
- Cafe Restaurants, Northport
- Campgrounds, Northport
- Candy, Nut & Confectionery Wholesale & Retail, Northport - Candy Stores
- Canoes & Kayaks, Northport - Equipment, Gear, PFD, Paddles & Accessories
- Canvas Goods & Products, Northport
- Car Detailing & Wash Service, Northport - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Northport
- Cargo Containers, Northport - Freight Containers
- Carpet Installation & Cleaning - Commercial & Industrial, Northport - Rug Cleaners
- Carpet, Rug & Linoleum Flooring Dealers, Northport
- Casual Dining Restaurants, Northport
- Caterers Food Services, Northport
- Catholic Churches, Northport
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Northport
- Cellular & Mobile Phone Service, Northport
- Cemeteries Equipment & Supplies, Northport
- Central American Restaurants, Northport
- Ceramic Tile, Northport - Wholesale, Manufacturers & Suppliers
- Chambers Of Commerce, Northport
- Child Care & Day Care Services, Northport
- Children's Clothing Stores, Northport - Infant, Babies & Kids Clothing
- Chinese Restaurants, Northport
- Chiropractor, Northport
- Christmas Decorations & Lights, Northport
- Churches 1 Of 3, Northport
- Churches 2 Of 3, Northport
- Churches Christian Science, Northport
- Cigar, Cigarette & Tobacco Store & Supplies, Northport
- City & County Administrative Agencies, Northport
- City & County Government, Northport
- City & County Law Enforcement, Northport
- Cleaning & Restoration Contractors, Including Sandblasting, Northport
- Clinics, Northport
- Clock & Watch Stores, Northport
- Clocks Retail, Northport
- Closet Designing & Remodeling, Northport - Custom Closets
- Clothing Stores, Northport - Clothes & Accessories
- Coffee, Northport
- Coffee & Tea - Wholesale, Northport
- Coffee, Espresso & Tea House Restaurants, Northport
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- Collectibles, Northport
- Commercial & Industrial Laundry, Northport
- Commercial Equipment, Northport
- Commercial Printing Manufacturers, Northport
- Communications Services, Northport
- Community & Recreational Facilities, Northport
- Community Services, Northport
- Computer & Audio Visual Services, Northport
- Computer & Laptop Repair, Northport - PC Repair Services
- Computer & Software Stores, Northport
- Computer Aided Design Systems & Services, Northport - CAD
- Computer Networks, Northport - Design & Systems
- Computer Repair, Northport
- Computer Software & Services, Northport
- Computer Software Publishers & Developers, Northport
- Computer Software Service, Northport
- Computer Stores, Northport
- Computer Supplies, Parts, Equipments & Accessories, Northport
- Concrete Contractors, Northport - Concrete Construction & Concrete Companies
- Construction, Northport
- Construction & Civil Engineer, Northport
- Construction Services, Northport
- Consultants & Services, Northport
- Contractors Supplies & Equipment, Northport
- Convention & Meeting Facilities, Northport - Meeting Rooms
- Cookies, Northport
- Copying & Duplicating Services, Northport
- Corporate Employees Health Programs, Northport
- Country Clubs, Northport
- Country Cooking Restaurants, Northport
- County Police, Northport
- Court Reporter , Northport - Stenographer & Convention Reporters
- Craft Supplies, Northport - Hobby & Craft Stores
- Crane Rental & Leasing, Northport
- Credit & Debt Counseling Services, Northport
- Credit Unions, Northport
- Cruise Agents, Northport - Travel Agents
- Cruise Lines, Northport - Cruises
- Curtains, Drapes & Window Treatments and Coverings, Northport - Drapery & Upholstery Fabric Stores
- Custom Sewing & Alterations, Northport
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