- Cafe Restaurants, Duquesne
- Cars, Truck, Van & SUV Car Dealerships, Duquesne - Auto Dealers
- Casual Dining Restaurants, Duquesne
- Caterers Food Services, Duquesne
- Catholic Churches, Duquesne
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Duquesne
- Cellular & Mobile Phone Service, Duquesne
- Charitable & Non-Profit Organizations, Duquesne
- Child Care & Day Care Services, Duquesne
- Child Care - Day Care - Private, Duquesne
- Child Related Social Services, Duquesne
- Chimney & Fireplace Construction Contractors, Duquesne - Installation, Cleaning & Repair Services
- Christian Churches, Duquesne
- Church Of Christ, Duquesne
- Churches 1 Of 3, Duquesne
- Churches 2 Of 3, Duquesne
- Churches 3 Of 3, Duquesne
- City & County Administrative Agencies, Duquesne
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- City & County Government, Duquesne
- City & County Law Enforcement, Duquesne
- Coating Engraving & Allied Services Manufacturing, Duquesne
- Commercial Equipment, Duquesne
- Communications Services, Duquesne
- Community Services, Duquesne
- Condiments & Sauces, Duquesne
- Construction, Duquesne
- Consultants & Services, Duquesne
- Control Systems & Regulators, Duquesne
- Convenience Stores, Duquesne
- Cooking Services, Duquesne
- Coroners, Duquesne
- County Police, Duquesne
- Credit Unions, Duquesne
- Cremation Services, Supplies & Equipment, Duquesne
- Cultural & Tribal Organizations & Clubs, Duquesne
- Custom Sewing & Alterations, Duquesne
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