- Cable TV Companies & Services, Duncannon
- Cafe Restaurants, Duncannon
- Campgrounds, Duncannon
- Carpet, Rug & Linoleum Flooring Dealers, Duncannon
- Cars, Truck, Van & SUV Car Dealerships, Duncannon - Auto Dealers
- Casual Dining Restaurants, Duncannon
- Catholic Churches, Duncannon
- Child Care & Day Care Services, Duncannon
- Child Related Social Services, Duncannon
- Chinese Restaurants, Duncannon
- Christian Churches, Duncannon
- Church Of Christ, Duncannon
- Church Of God, Duncannon
- Churches 1 Of 3, Duncannon
- Churches 2 Of 3, Duncannon
- Churches 3 Of 3, Duncannon
- City & County Administrative Agencies, Duncannon
- City & County Government, Duncannon
- Cleaning Supplies & Equipment, Duncannon
- Clinics, Duncannon
- Coin Operated Machines & Equipment, Duncannon
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- Commercial Equipment, Duncannon
- Communications Services, Duncannon
- Community Services, Duncannon
- Computer & Laptop Repair, Duncannon - PC Repair Services
- Computer & Software Stores, Duncannon
- Computer Repair, Duncannon
- Computer Software & Services, Duncannon
- Computer Software Service, Duncannon
- Concrete, Duncannon - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Duncannon
- Concrete Contractors, Duncannon - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Duncannon
- Condiments & Sauces, Duncannon
- Construction, Duncannon
- Construction Services, Duncannon
- Consultants & Services, Duncannon
- Convenience Stores, Duncannon
- Credit Unions, Duncannon
- Cremation Services, Supplies & Equipment, Duncannon
- Custom Furniture, Duncannon - Furniture Designers & Custom Builders
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