- Cable TV Companies & Services, Hallowell
- Cafe Restaurants, Hallowell
- Candy, Nut & Confectionery Wholesale & Retail, Hallowell - Candy Stores
- Carpet Rug & Upholstery Cleaners, Hallowell
- Carpet, Rug & Linoleum Flooring Dealers, Hallowell
- Cars, Truck, Van & SUV Car Dealerships, Hallowell - Auto Dealers
- Casual Dining Restaurants, Hallowell
- Caterers Food Services, Hallowell
- Ceramic Tile Flooring, Hallowell
- Ceramic Tile Installation - Repair, Hallowell - Ceramic Tiles Contractors
- Chinese Restaurants, Hallowell
- Chiropractor, Hallowell
- Churches 1 Of 3, Hallowell
- Cigar, Cigarette & Tobacco Store & Supplies, Hallowell
- City & County Government, Hallowell
- Cleaning & Maintenance Services, Hallowell
- Clinics, Hallowell
- Clothing Stores, Hallowell - Clothes & Accessories
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- Cocktail Lounges, Hallowell
- Coffee, Espresso & Tea House Restaurants, Hallowell
- Coin Dealers & Supplies , Hallowell
- Commercial Printing Manufacturers, Hallowell
- Communications Services, Hallowell
- Community & Recreational Facilities, Hallowell
- Community Services, Hallowell
- Concrete Breaking, Coring, Cutting, Drilling & Sawing, Hallowell
- Concrete Contractors, Hallowell - Concrete Construction & Concrete Companies
- Congregational Church, Hallowell
- Construction, Hallowell
- Consultants & Services, Hallowell
- Consumer Organizations & Cooperatives, Hallowell
- Consumer Protection, Hallowell
- Copying & Duplicating Services, Hallowell
- Counseling Services, Hallowell
- Crushing & Pulverizing Services, Hallowell
- Curtains, Drapes & Window Treatments and Coverings, Hallowell - Drapery & Upholstery Fabric Stores
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