- Cafe Restaurants, Waterville
- Carpet, Rug & Linoleum Flooring Dealers, Waterville
- Casual Dining Restaurants, Waterville
- Catalog Services, Waterville
- Catalog, Mail-Order & Electronic Shopping, Waterville
- Cemeteries Maintenance & Service, Waterville
- Child Abuse Information & Treatment Centers, Waterville
- Child Related Social Services, Waterville
- Chinese Restaurants, Waterville
- Chiropractor, Waterville
- Churches 1 Of 3, Waterville
- Churches 2 Of 3, Waterville
- City & County Administrative Agencies, Waterville
- City & County Government, Waterville
- City & County Law Enforcement, Waterville
- Clinics, Waterville
- Coffee, Espresso & Tea House Restaurants, Waterville
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- Collision Repair & Services, Waterville
- Commercial Equipment, Waterville
- Community & Recreational Facilities, Waterville
- Community Services, Waterville
- Computer & Audio Visual Services, Waterville
- Computer Software Development, Waterville
- Computer System Consultants, Waterville - IT Consulting Services
- Computer System Designers & Consultants, Waterville
- Concrete Supplies & Equipment, Waterville - Concrete Grinder, Concrete Pumping, Cement Mixer, etc
- Construction, Waterville
- Construction & Civil Engineer, Waterville
- Construction Services, Waterville
- Consultants & Services, Waterville
- Convenience Stores, Waterville
- Cooking, Food & Beverage Equipment, Waterville
- County Police, Waterville
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