- Cabinets & Cabinet Hardware, Groton
- Cafe Restaurants, Groton
- Carpenters, Groton - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Groton
- Casual Dining Restaurants, Groton
- Caterers Food Services, Groton
- Central American Restaurants, Groton
- Child Care & Day Care Services, Groton
- Chimney Cleaning & Repair, Groton - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Groton
- Chiropractor, Groton
- Churches 1 Of 3, Groton
- City & County Government, Groton
- Cleaning & Maintenance Services, Groton
- Cleaning & Restoration Contractors, Including Sandblasting, Groton
- Clergy, Groton
- Clothing Stores, Groton - Clothes & Accessories
- Coffee, Groton
- Coffee, Espresso & Tea House Restaurants, Groton
- Colleges & Universities, Groton
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- Commercial & Industrial Photographers, Groton
- Communications Services, Groton
- Community Services, Groton
- Computer & Audio Visual Services, Groton
- Computer & Software Stores, Groton
- Computer Repair, Groton
- Computer Software & Services, Groton
- Computer Software Service, Groton
- Computer System Consultants, Groton - IT Consulting Services
- Computer System Designers & Consultants, Groton
- Congregational Church, Groton
- Construction, Groton
- Construction Companies, Groton
- Construction Services, Groton
- Consultants & Services, Groton
- Convenience Stores, Groton
- Convention & Meeting Facilities, Groton - Meeting Rooms
- Country Clubs, Groton
- Country Cooking Restaurants, Groton
- Customer Service Representatives, Groton
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