- Casual Dining Restaurants, Hubbardston
- Charitable & Non-Profit Organizations, Hubbardston
- Cheese Products, Hubbardston - Cheese Shops
- Child Care & Day Care Services, Hubbardston
- Chimney Cleaning & Repair, Hubbardston - Fireplace - Chimney Sweep Services
- City & County Government, Hubbardston
- Cleaning & Maintenance Services, Hubbardston
- CNC Machine Shop, Hubbardston
- Commercial Equipment, Hubbardston
- Community Services, Hubbardston
- Computer & Software Stores, Hubbardston
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- Computer Stores, Hubbardston
- Construction, Hubbardston
- Construction Services, Hubbardston
- Consultants & Services, Hubbardston
- Contractor Equipment & Supplies, Hubbardston - Construction Equipment & Machinery
- Contractors Supplies & Equipment, Hubbardston
- Convenience Stores, Hubbardston
- Credit Unions, Hubbardston
- Custom Furniture, Hubbardston - Furniture Designers & Custom Builders
- Custom Sewing & Alterations, Hubbardston
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