- Cafe Restaurants, Chelmsford
- Calvary Chapel Church, Chelmsford
- Campgrounds, Chelmsford
- Candy & Confectionary Equipment, Chelmsford
- Candy, Nut & Confectionery Wholesale & Retail, Chelmsford - Candy Stores
- Car Detailing & Wash Service, Chelmsford - Auto Detailing
- Car Rental, Chelmsford - Rental Cars & Lease Service
- Car Wash, Cleaning, Wax & Polish Service, Chelmsford
- Career & Vocational Counseling, Chelmsford
- Carpenters, Chelmsford - Carpentry Contractors
- Carpet & Rug Cleaning Equipment & Supplies Rental, Chelmsford
- Carpet Rug & Upholstery Cleaners, Chelmsford
- Carpet, Rug & Linoleum Flooring Dealers, Chelmsford
- Cars, Truck, Van & SUV Car Dealerships, Chelmsford - Auto Dealers
- Casual Dining Restaurants, Chelmsford
- Catalog, Mail-Order & Electronic Shopping, Chelmsford
- Caterers Food Services, Chelmsford
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Chelmsford
- Cellular & Mobile Phone Service, Chelmsford
- Central American Restaurants, Chelmsford
- Chemical & Toxic Material Research Services, Chelmsford
- Chicken Restaurants, Chelmsford
- Child Care & Day Care Services, Chelmsford
- Children & Family Entertainment, Chelmsford
- Children's Clothing Stores, Chelmsford - Infant, Babies & Kids Clothing
- Childrens After School Programs, Chelmsford
- Chinese Restaurants, Chelmsford
- Chiropractic Clinics, Chelmsford
- Chiropractor, Chelmsford
- Christian Churches, Chelmsford
- Church Of Christ, Chelmsford
- Churches 1 Of 3, Chelmsford
- Churches 2 Of 3, Chelmsford
- Churches 3 Of 3, Chelmsford
- City & County Government, Chelmsford
- Cleaning & Maintenance Services, Chelmsford
- Cleaning Equipment Rental, Chelmsford
- Clinics, Chelmsford
- Clock Repair, Chelmsford
- Clothing Stores, Chelmsford - Clothes & Accessories
- CNC Machine Shop, Chelmsford
- Coating Engraving & Allied Services Manufacturing, Chelmsford
- Coffee, Chelmsford
- Coffee & Tea - Wholesale, Chelmsford
- Coffee, Espresso & Tea House Restaurants, Chelmsford
- Coin Dealers & Supplies , Chelmsford
- Colleges & Universities, Chelmsford
- Commercial & Industrial Laundry, Chelmsford
- Commercial & Industrial Photographers, Chelmsford
- Commercial & Literacy Writings, Chelmsford
- Commercial Equipment, Chelmsford
- Commercial Printing, Chelmsford
- Commercial Printing Manufacturers, Chelmsford
- Commercial, Industrial & Office Space for Rent & Lease, Chelmsford
- Communication Equipment & Systems, Chelmsford
- Communications Consultants, Chelmsford
- Communications Services, Chelmsford
- Community & Recreational Facilities, Chelmsford
- Community Church, Chelmsford
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- Community Churches, Chelmsford
- Community Services, Chelmsford
- Computer & Audio Visual Services, Chelmsford
- Computer & Laptop Repair, Chelmsford - PC Repair Services
- Computer & Software Stores, Chelmsford
- Computer Graphics, Chelmsford
- Computer Graphics Services, Chelmsford
- Computer Network Supplies & Parts, Chelmsford
- Computer Networks, Chelmsford - Design & Systems
- Computer Repair, Chelmsford
- Computer Services, Chelmsford
- Computer Software & Services, Chelmsford
- Computer Software Development, Chelmsford
- Computer Software Publishers & Developers, Chelmsford
- Computer Software Service, Chelmsford
- Computer Stores, Chelmsford
- Computer Supplies, Parts, Equipments & Accessories, Chelmsford
- Computer System Consultants, Chelmsford - IT Consulting Services
- Computer System Designers & Consultants, Chelmsford
- Computer Training Schools, Chelmsford
- Concrete, Chelmsford - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Chelmsford
- Concrete Contractors, Chelmsford - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Chelmsford
- Condominiums & Townhomes for Rent, Chelmsford - Townhouses & Condos for Rent & Lease
- Congregational Church, Chelmsford
- Construction, Chelmsford
- Construction & Civil Engineer, Chelmsford
- Construction Equipment Rental & Leasing, Chelmsford
- Construction Services, Chelmsford
- Consultants & Services, Chelmsford
- Consumer Purchasing Services, Chelmsford
- Contact Lenses, Chelmsford
- Contractor Tools Rental & Leasing, Chelmsford
- Contractors Equipment & Supplies - Rental & Leasing, Chelmsford
- Control Systems & Regulators, Chelmsford
- Convenience Stores, Chelmsford
- Cooking Schools, Chelmsford
- Copier & Copy Machine Sales, Supplies, Service & Repair, Chelmsford
- Copying & Duplicating Services, Chelmsford
- Corporate Attorneys & Lawyers, Chelmsford
- Corporate Business Attorneys & Lawyers, Chelmsford
- Corporate Employees Health Programs, Chelmsford
- Corporate Lawyers & Attorneys, Chelmsford
- Cosmetology School, Chelmsford
- Counseling Professionals, Chelmsford
- Counseling Services, Chelmsford
- Coverall Supplies & Services, Chelmsford
- Craft Supplies, Chelmsford - Hobby & Craft Stores
- Crane Services, Chelmsford
- Cranes & Derricks, Chelmsford
- Cranes Hoisting & Rigging Service, Chelmsford - Crane Rental Service
- Credit & Debt Counseling Services, Chelmsford
- Credit Card Plan Services, Chelmsford
- Credit Unions, Chelmsford
- Cremation Services, Supplies & Equipment, Chelmsford
- Critical & Emergency Care Doctors, Chelmsford - Intensive Care Doctors, Physicians & Surgeons
- Cushions Retail, Chelmsford
- Custom Sewing & Alterations, Chelmsford
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