- Cabins Cottages & Chalet Rental, Rockville
- Cable TV Companies & Services, Rockville
- Campgrounds, Rockville
- Candy, Nut & Confectionery Wholesale & Retail, Rockville - Candy Stores
- Carpenters, Rockville - Carpentry Contractors
- Carpet, Rug & Linoleum Flooring Dealers, Rockville
- Carrier Air Conditioning, Rockville - Air Conditioner Contractors & Systems
- Cars, Truck, Van & SUV Car Dealerships, Rockville - Auto Dealers
- Casual Dining Restaurants, Rockville
- Central American Restaurants, Rockville
- Chambers Of Commerce, Rockville
- Chiropractic Information & Referral Services, Rockville - Educational, Referral & Support Service Centers
- Chiropractor, Rockville
- Christian Churches, Rockville
- Churches 1 Of 3, Rockville
- Churches 2 Of 3, Rockville
- City & County Administrative Agencies, Rockville
- City & County Correctional Facilities, Rockville
- City & County Government, Rockville
- City & County Law Enforcement, Rockville
- Clinics, Rockville
- Coaching Business & Personal, Rockville
- Cocktail Lounges, Rockville
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- Collectibles, Rockville
- Colleges & Universities, Rockville
- Commercial Printing, Rockville
- Communications Services, Rockville
- Community & Recreational Facilities, Rockville
- Community Based Residential Facilities, Rockville
- Community Centers, Rockville
- Community Services, Rockville
- Computer & Audio Visual Services, Rockville
- Computer & Software Stores, Rockville
- Computer System Consultants, Rockville - IT Consulting Services
- Computer System Designers & Consultants, Rockville
- Condiments & Sauces, Rockville
- Construction, Rockville
- Construction Equipment & Supplies, Rockville
- Construction Services, Rockville
- Consultants & Services, Rockville
- Contact Lenses, Rockville
- Convenience Stores, Rockville
- Cosmetology School, Rockville
- Counseling Services, Rockville
- County Police, Rockville
- Cremation Services, Supplies & Equipment, Rockville
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