- Cafe Restaurants, Harwich
- Camper, Rvs & Travel Trailer Dealers, Harwich
- Car Detailing & Wash Service, Harwich - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Harwich
- Carpenters, Harwich - Carpentry Contractors
- Carpet & Carpet Equipment & Supplies Dealers, Harwich
- Carpet & Rugs Repair & Binding, Harwich
- Carpet Rug & Upholstery Cleaners, Harwich
- Carpet, Rug & Linoleum Flooring Dealers, Harwich
- Cars, Truck, Van & SUV Car Dealerships, Harwich - Auto Dealers
- Casual Dining Restaurants, Harwich
- Caterers Food Services, Harwich
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Harwich
- Cellular & Mobile Phone Service, Harwich
- Cemeteries & Crematories, Harwich
- Charitable & Non-Profit Organizations, Harwich
- Chemical Compounds, Harwich
- Chemicals & Related Products, Harwich
- Child Care & Day Care Services, Harwich
- Childbirth Education & Preparation, Harwich
- Chimney Cleaning & Repair, Harwich - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Harwich
- Chiropractor, Harwich
- Churches 1 Of 3, Harwich
- Churches 3 Of 3, Harwich
- City & County Government, Harwich
- City & County Law Enforcement, Harwich
- Cleaning & Maintenance Services, Harwich
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- Cleaning & Restoration Contractors, Including Sandblasting, Harwich
- Clinics, Harwich
- Clothing Stores, Harwich - Clothes & Accessories
- Coffee, Harwich
- Coffee, Espresso & Tea House Restaurants, Harwich
- Commercial, Industrial & Office Space for Rent & Lease, Harwich
- Communications Services, Harwich
- Community & Recreational Facilities, Harwich
- Community Church, Harwich
- Community Churches, Harwich
- Community Services, Harwich
- Computer & Audio Visual Services, Harwich
- Computer System Consultants, Harwich - IT Consulting Services
- Computer System Designers & Consultants, Harwich
- Concrete Breaking, Coring, Cutting, Drilling & Sawing, Harwich
- Concrete Contractors, Harwich - Concrete Construction & Concrete Companies
- Condominiums & Townhomes for Rent, Harwich - Townhouses & Condos for Rent & Lease
- Congregational Church, Harwich
- Construction, Harwich
- Construction Companies, Harwich
- Construction Services, Harwich
- Consultants & Services, Harwich
- Contractors Supplies & Equipment, Harwich
- Convenience Stores, Harwich
- County Police, Harwich
- Cremation Services, Supplies & Equipment, Harwich
- Custom Home Builders, Harwich - Custom Homes
- Cut Stone & Stone Products Manufacturers, Harwich
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