- Cable TV Companies & Services, Johnstown
- Cafe Restaurants, Johnstown
- Campgrounds, Johnstown
- Cargo Containers, Johnstown - Freight Containers
- Carpet & Rug Cleaners Water Extraction & Restoration, Johnstown
- Carpet Rug & Upholstery Cleaners, Johnstown
- Casual Dining Restaurants, Johnstown
- Caterers Food Services, Johnstown
- Catholic Churches, Johnstown
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Johnstown
- Cellular & Mobile Phone Service, Johnstown
- Central American Restaurants, Johnstown
- Chemical & Toxic Material Research, Johnstown
- Chemists Professional, Johnstown
- Chinese Restaurants, Johnstown
- Chiropractor, Johnstown
- Church Of Jesus Christ Of Latter Day Saints, Johnstown
- Churches 1 Of 3, Johnstown
- City & County Administrative Agencies, Johnstown
- City & County Government, Johnstown
- City & County Law Enforcement, Johnstown
- Cleaning & Maintenance Services, Johnstown
- Cleaning & Restoration Contractors, Including Sandblasting, Johnstown
- Clinics, Johnstown
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- Clothing Stores, Johnstown - Clothes & Accessories
- Coffee & Tea Stores, Johnstown
- Coffee, Espresso & Tea House Restaurants, Johnstown
- Commercial Equipment, Johnstown
- Commercial Printing, Johnstown
- Commercial Printing Manufacturers, Johnstown
- Communications Consultants, Johnstown
- Communications Services, Johnstown
- Community & Recreational Facilities, Johnstown
- Community Church, Johnstown
- Community Churches, Johnstown
- Community Services, Johnstown
- Concrete, Johnstown - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Johnstown
- Concrete Contractors, Johnstown - Concrete Construction & Concrete Companies
- Concrete Ditch Liners, Johnstown
- Concrete Product Manufacturers, Johnstown
- Construction, Johnstown
- Consultants & Services, Johnstown
- Convenience Stores, Johnstown
- Cosmetics, Johnstown
- County Police, Johnstown
- Cranes Hoisting & Rigging Service, Johnstown - Crane Rental Service
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