- Cabins Cottages & Chalet Rental, Northborough
- Cable TV Companies & Services, Northborough
- Cafe Restaurants, Northborough
- Camping Supplies & Equipment Stores, Northborough - Tents, Gear & Accessories
- Candy, Nut & Confectionery Wholesale & Retail, Northborough - Candy Stores
- Carpenters, Northborough - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Northborough
- Carpet, Rug & Linoleum Flooring Dealers, Northborough
- Cars, Truck, Van & SUV Car Dealerships, Northborough - Auto Dealers
- Casual Dining Restaurants, Northborough
- Caterers Food Services, Northborough
- Catholic Churches, Northborough
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Northborough
- Cellular & Mobile Phone Service, Northborough
- Central American Restaurants, Northborough
- Chemicals & Related Products, Northborough
- Child Care & Day Care Services, Northborough
- Child Care - Day Care - Private, Northborough
- Children's Clothing Stores, Northborough - Infant, Babies & Kids Clothing
- Childrens After School Programs, Northborough
- Chimney Cleaning & Repair, Northborough - Fireplace - Chimney Sweep Services
- Chinese Restaurants, Northborough
- Chiropractor, Northborough
- Christian Churches, Northborough
- Church Of Christ, Northborough
- Churches 2 Of 3, Northborough
- Churches Seventh Day Adventist, Northborough
- City & County Government, Northborough
- City & County Law Enforcement, Northborough
- Cleaning & Maintenance Services, Northborough
- Clinics, Northborough
- Clothing & Accessories Resale & Consignment Shops, Northborough
- Clothing Stores, Northborough - Clothes & Accessories
- Coffee, Northborough
- Coffee & Tea - Wholesale, Northborough
- Coffee & Tea Stores, Northborough
- Coffee, Espresso & Tea House Restaurants, Northborough
- Commercial & Industrial Photographers, Northborough
- Commercial Equipment, Northborough
- Commercial Writing Services, Northborough
- Commercial, Industrial & Office Space for Rent & Lease, Northborough
- Communication Equipment & Systems, Northborough
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- Communications Consultants, Northborough
- Communications Contractors, Northborough
- Communications Services, Northborough
- Community & Recreational Facilities, Northborough
- Community Services, Northborough
- Compressors Air & Gas Rental, Northborough
- Computer & Audio Visual Services, Northborough
- Computer & Laptop Repair, Northborough - PC Repair Services
- Computer & Software Stores, Northborough
- Computer Networks, Northborough - Design & Systems
- Computer Programming & Software Development Services, Northborough
- Computer Repair, Northborough
- Computer Services, Northborough
- Computer Software & Services, Northborough
- Computer Software Service, Northborough
- Computer Stores, Northborough
- Computer System Consultants, Northborough - IT Consulting Services
- Computer System Designers & Consultants, Northborough
- Computer Training Schools, Northborough
- Condiments & Sauces, Northborough
- Condominiums & Townhomes for Rent, Northborough - Townhouses & Condos for Rent & Lease
- Construction, Northborough
- Construction & Civil Engineer, Northborough
- Construction Machinery, Northborough - Mining Machinery
- Construction Services, Northborough
- Consultants & Services, Northborough
- Consultants Referral Service, Northborough
- Consulting Services, Northborough - Internet Consultants
- Contact Lenses, Northborough
- Convenience Stores, Northborough
- Convention Services - Other, Northborough
- Corporate Employees Health Programs, Northborough
- Cosmetics, Northborough
- Cosmetics & Perfumes Outlets, Northborough
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Northborough
- County Police, Northborough
- Craft Supplies, Northborough - Hobby & Craft Stores
- Credit Unions, Northborough
- Criminal Attorneys & Lawyers, Northborough
- Criminal Defense Attorneys & Lawyers, Northborough
- Criminal Defense Lawyers & Attorneys, Northborough
- Customer Service Representatives, Northborough
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