- Cabins Cottages & Chalet Rental, Millbury
- Casual Dining Restaurants, Millbury
- Caterers Food Services, Millbury
- Child Care & Day Care Services, Millbury
- Christian Churches, Millbury
- Church Of Christ, Millbury
- Churches 1 Of 3, Millbury
- City & County Government, Millbury
- CNC Machine Shop, Millbury
- Commercial Printing Manufacturers, Millbury
- Communications Services, Millbury
- Community & Recreational Facilities, Millbury
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- Community Services, Millbury
- Computer & Laptop Repair, Millbury - PC Repair Services
- Computer & Software Stores, Millbury
- Computer Repair, Millbury
- Computer Software & Services, Millbury
- Computer Software Service, Millbury
- Construction, Millbury
- Consultants & Services, Millbury
- Convention & Meeting Facilities, Millbury - Meeting Rooms
- Cremation Services, Supplies & Equipment, Millbury
- Custom Designed Replica Car Dealers, Millbury - Auto Dealers
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