- Casual Dining Restaurants, Groton
- Caterers Food Services, Groton
- Catholic Churches, Groton
- Chinese Restaurants, Groton
- Christian Churches, Groton
- Church Of Christ, Groton
- Churches 1 Of 3, Groton
- City & County Government, Groton
- CNC Machine Shop, Groton
- Collectibles, Groton
- Community & Recreational Facilities, Groton
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- Community Centers, Groton
- Community Services, Groton
- Computer Networks, Groton - Design & Systems
- Concrete, Groton - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Groton
- Concrete Product Manufacturers, Groton
- Construction, Groton
- Convenience Stores, Groton
- Cruise Agents, Groton - Travel Agents
- Cruise Lines, Groton - Cruises
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