- Cabins Cottages & Chalet Rental, Darien
- Cable TV Companies & Services, Darien
- Cafe Restaurants, Darien
- Candy, Nut & Confectionery Wholesale & Retail, Darien - Candy Stores
- Car Detailing & Wash Service, Darien - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Darien
- Carpenters, Darien - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Darien
- Carpet, Rug & Linoleum Flooring Dealers, Darien
- Cars, Truck, Van & SUV Car Dealerships, Darien - Auto Dealers
- Casual Dining Restaurants, Darien
- Caterers Equipment & Supplies, Darien
- Caterers Food Services, Darien
- Catholic Churches, Darien
- Ceiling Contractors, Darien - Ceilings
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Darien
- Cellular & Mobile Phone Service, Darien
- Cemetery Subdividers & Developers, Darien
- Central American Restaurants, Darien
- Chambers Of Commerce, Darien
- Cheese Products, Darien - Cheese Shops
- Chemical Compounds, Darien
- Chemical Products, Darien - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals & Related Products, Darien
- Child Care & Day Care Services, Darien
- Child Related Social Services, Darien
- Children's Clothing Stores, Darien - Infant, Babies & Kids Clothing
- Childrens After School Programs, Darien
- Chimney & Fireplace Construction Contractors, Darien - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Darien - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Darien
- Chiropractor, Darien
- Christian Churches, Darien
- Churches 1 Of 3, Darien
- Churches 2 Of 3, Darien
- Churches Christian Science, Darien
- Cigar, Cigarette & Tobacco Store & Supplies, Darien
- Cigarettes Manufacturers, Darien
- City & County Administrative Agencies, Darien
- City & County Government, Darien
- City & County Law Enforcement, Darien
- Cleaning & Maintenance Services, Darien
- Cleaning & Restoration Contractors, Including Sandblasting, Darien
- Clinics, Darien
- Clothing Stores, Darien - Clothes & Accessories
- CNC Machine Shop, Darien
- Coaching Business & Personal, Darien
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- Coffee, Darien
- Coffee & Tea Stores, Darien
- Coffee, Espresso & Tea House Restaurants, Darien
- Colleges & Universities, Darien
- Commercial Physical Research, Darien
- Commercial Printing Manufacturers, Darien
- Communications Consultants, Darien
- Communications Services, Darien
- Community & Recreational Facilities, Darien
- Community Services, Darien
- Computer & Audio Visual Services, Darien
- Computer & Laptop Repair, Darien - PC Repair Services
- Computer & Software Stores, Darien
- Computer Repair, Darien
- Computer Services, Darien
- Computer Software & Services, Darien
- Computer Software Service, Darien
- Computer Stores, Darien
- Computer Supplies, Parts, Equipments & Accessories, Darien
- Computer System Consultants, Darien - IT Consulting Services
- Computer System Designers & Consultants, Darien
- Computer Training Schools, Darien
- Concrete Contractors, Darien - Concrete Construction & Concrete Companies
- Construction, Darien
- Construction Companies, Darien
- Construction Services, Darien
- Consultants & Services, Darien
- Convents & Monasteries, Darien
- Cooking Oils & Shortenings, Darien
- Copying & Duplicating Services, Darien
- Copyright, Patent & Trademark Attorneys & Lawyers, Darien
- Copyright, Patent & Trademark Attorneys & Lawyers, Darien
- Copyright, Patent & Trademark Lawyers & Attorneys, Darien
- Cosmetics, Darien
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Darien
- Counseling Services, Darien
- Country Clubs, Darien
- County Police, Darien
- Credit & Debt Counseling Services, Darien
- Credit Card Merchant Services, Darien
- Credit Card Plan Services, Darien
- Cremation Services, Supplies & Equipment, Darien
- Cruise Agents, Darien - Travel Agents
- Cruise Lines, Darien - Cruises
- Curtains, Drapes & Window Treatments and Coverings, Darien - Drapery & Upholstery Fabric Stores
- Custom Sewing & Alterations, Darien
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