- Cafe Restaurants, Rollinsford
- Carpenters, Rollinsford - Carpentry Contractors
- Cars, Truck, Van & SUV Car Dealerships, Rollinsford - Auto Dealers
- Casual Dining Restaurants, Rollinsford
- City & County Government, Rollinsford
- CNC Machine Shop, Rollinsford
- Commercial & Industrial Photographers, Rollinsford
- Commercial Printing, Rollinsford
- Communications Services, Rollinsford
- Community Services, Rollinsford
- Computer & Audio Visual Services, Rollinsford
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- Computer & Software Stores, Rollinsford
- Computer Cable & Wire Installation, Rollinsford
- Computer Repair, Rollinsford
- Computer Room - Installation & Equipment, Rollinsford
- Computer Software & Services, Rollinsford
- Computer Software Service, Rollinsford
- Construction, Rollinsford
- Consultants & Services, Rollinsford
- Convenience Stores, Rollinsford
- Craft Supplies, Rollinsford - Hobby & Craft Stores
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