- Cancer Educational, Referral & Support Service Centers, Altoona
- Car Detailing & Wash Service, Altoona - Auto Detailing
- Carburetor, Altoona
- Cargo Containers, Altoona - Freight Containers
- Carpet & Rug Cleaners Water Extraction & Restoration, Altoona
- Carpet Rug & Upholstery Cleaners, Altoona
- Cars, Truck, Van & SUV Car Dealerships, Altoona - Auto Dealers
- Casual Dining Restaurants, Altoona
- Caterers Food Services, Altoona
- Catholic Churches, Altoona
- Ceiling Contractors, Altoona - Ceilings
- Charitable & Non-Profit Organizations, Altoona
- Child Care & Day Care Services, Altoona
- Chiropractor, Altoona
- Churches 1 Of 3, Altoona
- Churches 2 Of 3, Altoona
- Churches Seventh Day Adventist, Altoona
- City & County Administrative Agencies, Altoona
- City & County Government, Altoona
- City & County Law Enforcement, Altoona
- Cleaning & Maintenance Services, Altoona
- Cleaning & Restoration Contractors, Including Sandblasting, Altoona
- Clinics, Altoona
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- Colleges & Universities, Altoona
- Commercial Equipment, Altoona
- Commercial Printing, Altoona
- Commercial Printing Manufacturers, Altoona
- Communications Contractors, Altoona
- Communications Services, Altoona
- Community Services, Altoona
- Condiments & Sauces, Altoona
- Construction, Altoona
- Construction & Civil Engineer, Altoona
- Consultants & Services, Altoona
- Convenience Stores, Altoona
- Convention & Meeting Facilities, Altoona - Meeting Rooms
- Cooking, Food & Beverage Equipment, Altoona
- Cooling System & Parts, Altoona - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copier & Copy Machine Sales, Supplies, Service & Repair, Altoona
- Copier Repair & Service, Altoona
- Counseling Professionals, Altoona
- Country Clubs, Altoona
- County Police, Altoona
- Credit Unions, Altoona
- Cremation Services, Supplies & Equipment, Altoona
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