- Cable Conduit & Pole Contractors, Stittsville
- Cafe Restaurants, Stittsville
- Campers & Pick-Up Canopies Parts & Supplies, Stittsville
- Car Detailing & Wash Service, Stittsville - Auto Detailing
- Cars, Truck, Van & SUV Car Dealerships, Stittsville - Auto Dealers
- Casual Dining Restaurants, Stittsville
- Catalog Services, Stittsville
- Catalog, Mail-Order & Electronic Shopping, Stittsville
- Caterers Food Services, Stittsville
- Cellular & Mobile Phone Service, Stittsville
- Check Cashing & Financial Service Centers, Stittsville
- Chemical Product Manufacturers, Stittsville
- Child Care & Day Care Services, Stittsville
- Children's Clothing Stores, Stittsville - Infant, Babies & Kids Clothing
- Childrens & Infant Clothing Manufacturers, Stittsville
- Chinese Grocery Stores, Stittsville
- Chinese Restaurants, Stittsville
- Chiropractic Clinics, Stittsville
- Chiropractor, Stittsville
- Churches 1 Of 3, Stittsville
- Churches 3 Of 3, Stittsville
- Cigar, Cigarette & Tobacco Store & Supplies, Stittsville
- Cleaning & Maintenance Services, Stittsville
- Clinics, Stittsville
- Clothing Stores, Stittsville - Clothes & Accessories
- Cocktail Lounges, Stittsville
- Coffee, Stittsville
- Commercial Equipment, Stittsville
- Commercial Printing Manufacturers, Stittsville
- Communications Cable Contractors, Stittsville
- Communications Services, Stittsville
- Community & Recreational Facilities, Stittsville
- Community Services, Stittsville
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- Computer & Audio Visual Services, Stittsville
- Computer & Software Stores, Stittsville
- Computer Services, Stittsville
- Computer Stores, Stittsville
- Computer System Consultants, Stittsville - IT Consulting Services
- Concrete, Stittsville - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Stittsville
- Concrete Product Manufacturers, Stittsville
- Condiments & Sauces, Stittsville
- Construction, Stittsville
- Construction Companies, Stittsville
- Construction Management Services, Stittsville
- Construction Services, Stittsville
- Consultants & Services, Stittsville
- Convenience Stores, Stittsville
- Convention & Meeting Facilities, Stittsville - Meeting Rooms
- Convention Decorating Services, Stittsville
- Convention Services - Other, Stittsville
- Copying & Duplicating Services, Stittsville
- Copyright, Patent & Trademark Attorneys & Lawyers, Stittsville
- Copyright, Patent & Trademark Attorneys & Lawyers, Stittsville
- Copyright, Patent & Trademark Lawyers & Attorneys, Stittsville
- Corrosion Control, Stittsville
- Corrosion Control, Stittsville
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Stittsville
- Cosmetology School, Stittsville
- Coverall Supplies & Services, Stittsville
- Craft Supplies, Stittsville - Hobby & Craft Stores
- Crates & Crating Industrial, Stittsville
- Credit Card & Check Cashing Protection Services, Stittsville
- Crushed Stone & Rock, Stittsville - Crushed Granite, Concrete, Gravel, etc
- Curtains, Drapes & Window Treatments and Coverings, Stittsville - Drapery & Upholstery Fabric Stores
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