- Carpet Rug & Upholstery Cleaners, Mardela Springs
- Cars, Truck, Van & SUV Car Dealerships, Mardela Springs - Auto Dealers
- Christian Churches, Mardela Springs
- Church Of Christ, Mardela Springs
- Churches 1 Of 3, Mardela Springs
- Cleaning & Maintenance Services, Mardela Springs
- Cleaning & Restoration Contractors, Including Sandblasting, Mardela Springs
- Collectibles, Mardela Springs
- Commercial Printing Manufacturers, Mardela Springs
- Community Services, Mardela Springs
- Computer & Audio Visual Services, Mardela Springs
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- Computer System Consultants, Mardela Springs - IT Consulting Services
- Computer System Designers & Consultants, Mardela Springs
- Condiments & Sauces, Mardela Springs
- Construction, Mardela Springs
- Construction Estimators, Mardela Springs
- Construction Services, Mardela Springs
- Consultants & Services, Mardela Springs
- Convenience Stores, Mardela Springs
- Credit & Debt Counseling Services, Mardela Springs
- Credit Restoration Service, Mardela Springs
- Custom Sewing & Alterations, Mardela Springs
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