- Cafe Restaurants, Donora
- Carnivals, Fairs & Exhibitions, Donora
- Casual Dining Restaurants, Donora
- Caterers Food Services, Donora
- Catholic Churches, Donora
- Chemical Manufacturers, Donora
- Chemical Product Manufacturers, Donora
- Chemical Products, Donora - Chemical Distributors, Dealers, Wholesale, etc
- Chemicals & Related Products, Donora
- Child Care & Day Care Services, Donora
- Child Related Social Services, Donora
- Childrens After School Programs, Donora
- Chiropractor, Donora
- Church Of God, Donora
- Churches 1 Of 3, Donora
- Churches 2 Of 3, Donora
- Churches 3 Of 3, Donora
- City & County Government, Donora
- Cleaning & Restoration Contractors, Including Sandblasting, Donora
- Cleaning Supplies & Equipment, Donora
- Clergy, Donora
- Clinics, Donora
- CNC Machine Shop, Donora
- Coal & Coke, Donora
- Combustibles & Explosives, Donora
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- Commercial Equipment, Donora
- Commercial Printing, Donora
- Commercial Printing Manufacturers, Donora
- Community & Recreational Facilities, Donora
- Community Services, Donora
- Computer & Audio Visual Services, Donora
- Computer & Software Stores, Donora
- Computer Networks, Donora - Design & Systems
- Computer Services, Donora
- Computer Software & Services, Donora
- Computers Software & Services Security, Donora
- Concessionaires, Donora
- Concessionaires, Donora
- Condiments & Sauces, Donora
- Construction, Donora
- Construction Machinery, Donora - Mining Machinery
- Construction Services, Donora
- Consultants & Services, Donora
- Convenience Stores, Donora
- Convention & Meeting Facilities, Donora - Meeting Rooms
- Cooking, Food & Beverage Equipment, Donora
- Craft Supplies, Donora - Hobby & Craft Stores
- Credit Unions, Donora
- Cultural & Tribal Organizations & Clubs, Donora
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