- Cabins Cottages & Chalet Rental, Boothbay Harbor
- Cafe Restaurants, Boothbay Harbor
- Candy, Nut & Confectionery Wholesale & Retail, Boothbay Harbor - Candy Stores
- Casual Dining Restaurants, Boothbay Harbor
- Caterers Food Services, Boothbay Harbor
- Catholic Churches, Boothbay Harbor
- Cellular & Mobile Phone Service, Boothbay Harbor
- Chambers Of Commerce, Boothbay Harbor
- Charitable & Non-Profit Organizations, Boothbay Harbor
- Child Related Social Services, Boothbay Harbor
- Chinese Restaurants, Boothbay Harbor
- Chiropractor, Boothbay Harbor
- Churches 1 Of 3, Boothbay Harbor
- Churches 2 Of 3, Boothbay Harbor
- Churches Christian Science, Boothbay Harbor
- City & County Government, Boothbay Harbor
- Clam Bakes Catered, Boothbay Harbor
- Clergy, Boothbay Harbor
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- Clocks Retail, Boothbay Harbor
- Clothing Stores, Boothbay Harbor - Clothes & Accessories
- Coffee, Espresso & Tea House Restaurants, Boothbay Harbor
- Commercial Equipment, Boothbay Harbor
- Communications Services, Boothbay Harbor
- Community Services, Boothbay Harbor
- Computer & Audio Visual Services, Boothbay Harbor
- Computer & Laptop Repair, Boothbay Harbor - PC Repair Services
- Computer Networks, Boothbay Harbor - Design & Systems
- Computer Repair, Boothbay Harbor
- Computer System Consultants, Boothbay Harbor - IT Consulting Services
- Computer System Designers & Consultants, Boothbay Harbor
- Congregational Church, Boothbay Harbor
- Construction, Boothbay Harbor
- Convenience Stores, Boothbay Harbor
- Cooking, Food & Beverage Equipment, Boothbay Harbor
- Crab House Restaurants, Boothbay Harbor
- Custom Parts & Accessories, Boothbay Harbor
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