- Cable TV Companies & Services, Northfield
- Cafe Restaurants, Northfield
- Candy, Nut & Confectionery Wholesale & Retail, Northfield - Candy Stores
- Carpenters, Northfield - Carpentry Contractors
- Carpet Installation & Cleaning - Commercial & Industrial, Northfield - Rug Cleaners
- Casual Dining Restaurants, Northfield
- Catholic Churches, Northfield
- Charitable & Non-Profit Organizations, Northfield
- Chimney & Chimney Lining Material, Northfield
- Chimney & Fireplace Construction Contractors, Northfield - Installation, Cleaning & Repair Services
- Chimney Cleaning & Repair, Northfield - Fireplace - Chimney Sweep Services
- Chinese Grocery Stores, Northfield
- Chinese Restaurants, Northfield
- Christian Churches, Northfield
- Church Of Christ, Northfield
- Churches 1 Of 3, Northfield
- Churches 2 Of 3, Northfield
- City & County Government, Northfield
- City & County Law Enforcement, Northfield
- Clergy, Northfield
- Coffee, Northfield
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- Coffee, Espresso & Tea House Restaurants, Northfield
- Colleges & Universities, Northfield
- Commercial & Industrial Photographers, Northfield
- Communications Contractors, Northfield
- Communications Services, Northfield
- Community & Recreational Facilities, Northfield
- Community Church, Northfield
- Community Churches, Northfield
- Community Services, Northfield
- Computer & Laptop Repair, Northfield - PC Repair Services
- Computer & Software Stores, Northfield
- Computer Repair, Northfield
- Computer Software & Services, Northfield
- Computer Software Service, Northfield
- Congregational Church, Northfield
- Construction, Northfield
- Consultants & Services, Northfield
- Convenience Stores, Northfield
- Counseling Services, Northfield
- Country Clubs, Northfield
- County Police, Northfield
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