- Cable TV Companies & Services, Middlefield
- Cafe Restaurants, Middlefield
- Carpenters, Middlefield - Carpentry Contractors
- Casual Dining Restaurants, Middlefield
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Middlefield
- Cellular & Mobile Phone Service, Middlefield
- Chemicals & Related Products, Middlefield
- Child Care & Day Care Services, Middlefield
- Christian Churches, Middlefield
- Christmas Decorations & Lights, Middlefield
- Churches 1 Of 3, Middlefield
- Churches 3 Of 3, Middlefield
- City & County Government, Middlefield
- CNC Machine Shop, Middlefield
- Coating Engraving & Allied Services Manufacturing, Middlefield
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- Combustibles & Explosives, Middlefield
- Commercial & Industrial Photographers, Middlefield
- Commercial Equipment, Middlefield
- Commercial, Industrial & Office Space for Rent & Lease, Middlefield
- Communications Services, Middlefield
- Community Services, Middlefield
- Computer & Audio Visual Services, Middlefield
- Computer & Software Stores, Middlefield
- Computer Networks, Middlefield - Design & Systems
- Concrete Contractors, Middlefield - Concrete Construction & Concrete Companies
- Congregational Church, Middlefield
- Construction, Middlefield
- Construction Equipment Rental & Leasing, Middlefield
- Consultants & Services, Middlefield
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