- Cafe Restaurants, Darien
- Casual Dining Restaurants, Darien
- Caterers Food Services, Darien
- Churches 1 Of 3, Darien
- City & County Government, Darien
- Clinics, Darien
- Clocks Retail, Darien
- CNC Machine Shop, Darien
- Cocktail Lounges, Darien
- Commercial Printing, Darien
- Communications Services, Darien
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- Community & Recreational Facilities, Darien
- Community Church, Darien
- Community Churches, Darien
- Community Services, Darien
- Concrete Contractors, Darien - Concrete Construction & Concrete Companies
- Condiments & Sauces, Darien
- Construction, Darien
- Construction Companies, Darien
- Construction Services, Darien
- Consultants & Services, Darien
- Country Cooking Restaurants, Darien
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