- Cabins Cottages & Chalet Rental, Duncansville
- Camper, Rvs & Travel Trailer Dealers, Duncansville
- Campers & Pick-Up Canopies Parts & Supplies, Duncansville
- Campgrounds, Duncansville
- Canoes & Kayaks, Duncansville - Equipment, Gear, PFD, Paddles & Accessories
- Canvas Goods & Products, Duncansville
- Car Detailing & Wash Service, Duncansville - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Duncansville
- Card & Game Rooms & Services, Duncansville
- Carpenters, Duncansville - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Duncansville
- Carpet, Rug & Linoleum Flooring Dealers, Duncansville
- Cars, Truck, Van & SUV Car Dealerships, Duncansville - Auto Dealers
- Casual Dining Restaurants, Duncansville
- Caterers Food Services, Duncansville
- Cellular & Mobile Phone Service, Duncansville
- Ceramic Tile Flooring, Duncansville
- Ceramic Tile Installation - Repair, Duncansville - Ceramic Tiles Contractors
- Chemical Product Manufacturers, Duncansville
- Child Related Social Services, Duncansville
- Chiropractor, Duncansville
- Christian Churches, Duncansville
- Churches 1 Of 3, Duncansville
- Churches 2 Of 3, Duncansville
- Cigar, Cigarette & Tobacco Store & Supplies, Duncansville
- City & County Government, Duncansville
- Cleaning & Maintenance Services, Duncansville
- Cleaning & Restoration Contractors, Including Sandblasting, Duncansville
- Cleaning Supplies & Equipment, Duncansville
- Cleaning Supplies, Systems & Equipment, Duncansville - Janitorial Supplies
- Clinics, Duncansville
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- Coal & Coke, Duncansville
- Coffee & Tea Stores, Duncansville
- Collectibles, Duncansville
- Commercial Equipment, Duncansville
- Commercial Printing Manufacturers, Duncansville
- Communications Services, Duncansville
- Community & Recreational Facilities, Duncansville
- Community Services, Duncansville
- Computer & Audio Visual Services, Duncansville
- Computer & Laptop Repair, Duncansville - PC Repair Services
- Computer & Software Stores, Duncansville
- Computer Repair, Duncansville
- Computer Software & Services, Duncansville
- Computer Software Service, Duncansville
- Construction, Duncansville
- Construction & Civil Engineer, Duncansville
- Construction Companies, Duncansville
- Consultants & Services, Duncansville
- Contractor Equipment & Supplies, Duncansville - Construction Equipment & Machinery
- Contractors Equipment & Supplies - Rental & Leasing, Duncansville
- Convenience Stores, Duncansville
- Counseling Services, Duncansville
- Crane Services, Duncansville
- Cranes Hoisting & Rigging Service, Duncansville - Crane Rental Service
- Credit Unions, Duncansville
- Cremation Services, Supplies & Equipment, Duncansville
- Criminal Attorneys & Lawyers, Duncansville
- Criminal Defense Attorneys & Lawyers, Duncansville
- Criminal Defense Lawyers & Attorneys, Duncansville
- Cruise Agents, Duncansville - Travel Agents
- Cruise Lines, Duncansville - Cruises
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