- Cabins Cottages & Chalet Rental, Shefford
- Cable Conduit & Pole Contractors, Shefford
- Campgrounds, Shefford
- Candy, Nut & Confectionery Wholesale & Retail, Shefford - Candy Stores
- Canoes & Kayaks, Shefford - Equipment, Gear, PFD, Paddles & Accessories
- Charitable & Non-Profit Organizations, Shefford
- Chimney Cleaning & Repair, Shefford - Fireplace - Chimney Sweep Services
- City & County Government, Shefford
- Cleaning & Restoration Contractors, Including Sandblasting, Shefford
- Clinics, Shefford
- Commercial Equipment, Shefford
- Commercial Printing Manufacturers, Shefford
- Communications Cable Contractors, Shefford
- Communications Consultants, Shefford
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- Community & Recreational Facilities, Shefford
- Community Services, Shefford
- Computer & Audio Visual Services, Shefford
- Computer System Consultants, Shefford - IT Consulting Services
- Concierge Services, Shefford
- Concrete, Shefford - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Shefford
- Concrete Driveways & Sidewalks, Shefford
- Concrete Product Manufacturers, Shefford
- Construction, Shefford
- Consultants & Services, Shefford
- Convenience Stores, Shefford
- Cooking, Food & Beverage Equipment, Shefford
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