- Carpet Rug & Upholstery Cleaners, Walkersville
- Caskets Burial, Walkersville
- Casual Dining Restaurants, Walkersville
- Caterers Food Services, Walkersville
- Cellular & Mobile Phone Service, Walkersville
- Chicken Restaurants, Walkersville
- Child Care & Day Care Services, Walkersville
- Chinese Restaurants, Walkersville
- Chiropractor, Walkersville
- Christian Churches, Walkersville
- Church Of Christ, Walkersville
- Churches 1 Of 3, Walkersville
- Churches 2 Of 3, Walkersville
- City & County Administrative Agencies, Walkersville
- City & County Government, Walkersville
- Cleaning & Maintenance Services, Walkersville
- Clothing Stores, Walkersville - Clothes & Accessories
- CNC Machine Shop, Walkersville
- Commercial Equipment, Walkersville
- Commercial Printing Manufacturers, Walkersville
- Communications Services, Walkersville
- Community & Recreational Facilities, Walkersville
- Community Services, Walkersville
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- Computer & Audio Visual Services, Walkersville
- Computer & Laptop Repair, Walkersville - PC Repair Services
- Computer & Software Stores, Walkersville
- Computer Repair, Walkersville
- Computer Software & Services, Walkersville
- Computer Software Service, Walkersville
- Computer System Consultants, Walkersville - IT Consulting Services
- Computer System Designer & Consultant, Walkersville
- Computer System Designers & Consultants, Walkersville
- Concrete Contractors, Walkersville - Concrete Construction & Concrete Companies
- Condiments & Sauces, Walkersville
- Construction, Walkersville
- Construction Services, Walkersville
- Consultants & Services, Walkersville
- Continuing Education, Walkersville
- Convenience Stores, Walkersville
- Convention & Meeting Facilities, Walkersville - Meeting Rooms
- Cooking, Food & Beverage Equipment, Walkersville
- Cosmetics, Walkersville
- Cosmetics & Perfumes Outlets, Walkersville
- Cremation Services, Supplies & Equipment, Walkersville
- Crushed Stone & Rock, Walkersville - Crushed Granite, Concrete, Gravel, etc
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