- Campgrounds, East Haddam
- Carpenters, East Haddam - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, East Haddam
- Casual Dining Restaurants, East Haddam
- Child Related Social Services, East Haddam
- Churches 1 Of 3, East Haddam
- Churches 2 Of 3, East Haddam
- City & County Government, East Haddam
- Cleaning & Maintenance Services, East Haddam
- Coaching Business & Personal, East Haddam
- Coffee, Espresso & Tea House Restaurants, East Haddam
- Communications Equipment Manufacturers, East Haddam
- Community Church, East Haddam
- Community Churches, East Haddam
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- Community Services, East Haddam
- Computer & Audio Visual Services, East Haddam
- Computer & Software Stores, East Haddam
- Computer Supplies, Parts, Equipments & Accessories, East Haddam
- Computers Hardware & Supplies Networking Hardware, East Haddam
- Congregational Church, East Haddam
- Construction, East Haddam
- Construction Companies, East Haddam
- Construction Services, East Haddam
- Consultants & Services, East Haddam
- Control Systems & Regulators, East Haddam
- Convalescent Homes Placement Services, East Haddam - Convalescent Care
- Counseling Services, East Haddam
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