- Campgrounds, Haddam
- Casual Dining Restaurants, Haddam
- Chemicals & Related Products, Haddam
- Child Care & Day Care Services, Haddam
- Chinese Restaurants, Haddam
- Chiropractor, Haddam
- Churches 1 Of 3, Haddam
- City & County Government, Haddam
- Cleaning & Maintenance Services, Haddam
- Cleaning & Restoration Contractors, Including Sandblasting, Haddam
- Clinics, Haddam
- CNC Machine Shop, Haddam
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- Coffee, Haddam
- Coffee, Espresso & Tea House Restaurants, Haddam
- Combustibles & Explosives, Haddam
- Community Services, Haddam
- Construction, Haddam
- Construction Services, Haddam
- Consultants & Services, Haddam
- Contractor Equipment & Supplies, Haddam - Construction Equipment & Machinery
- Counseling Services, Haddam
- Credit & Debt Counseling Services, Haddam
- Curtains, Drapes & Window Treatments and Coverings, Haddam - Drapery & Upholstery Fabric Stores
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