- Cabins Cottages & Chalet Rental, Wallingford
- Casual Dining Restaurants, Wallingford
- Child Care & Day Care Services, Wallingford
- Chiropractor, Wallingford
- Churches 1 Of 3, Wallingford
- City & County Government, Wallingford
- Commercial Printing Manufacturers, Wallingford
- Communications Services, Wallingford
- Community Services, Wallingford
- Computer & Laptop Repair, Wallingford - PC Repair Services
- Computer Repair, Wallingford
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- Concierge Services, Wallingford
- Congregational Church, Wallingford
- Construction, Wallingford
- Construction Companies, Wallingford
- Consultants & Services, Wallingford
- Consulting Services, Wallingford - Internet Consultants
- Convalescent Homes Placement Services, Wallingford - Convalescent Care
- Convenience Stores, Wallingford
- Country Cooking Restaurants, Wallingford
- Crushed Stone & Rock, Wallingford - Crushed Granite, Concrete, Gravel, etc
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