- Cabinets & Cabinet Hardware, Duncanville
- Cabinets Refacing, Refinishing & Building, Duncanville - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Cafe Restaurants, Duncanville
- Campgrounds, Duncanville
- Candy Manufacturers, Duncanville
- Candy, Nut & Confectionery Wholesale & Retail, Duncanville - Candy Stores
- Canvas Goods & Products, Duncanville
- Car Detailing & Wash Service, Duncanville - Auto Detailing
- Car Rental, Duncanville - Rental Cars & Lease Service
- Car Tune Up Service, Duncanville - Auto Tune Up
- Car Wash, Cleaning, Wax & Polish Service, Duncanville
- Carpet Rug & Upholstery Cleaners, Duncanville
- Carpet, Rug & Linoleum Flooring Dealers, Duncanville
- Cars, Truck, Van & SUV Car Dealerships, Duncanville - Auto Dealers
- Casual Dining Restaurants, Duncanville
- Catholic Churches, Duncanville
- Cell & Mobile Installation Repairs, Duncanville
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Duncanville
- Cellular & Mobile Phone Service, Duncanville
- Central American Restaurants, Duncanville
- Chambers Of Commerce, Duncanville
- Check Cashing Services, Duncanville
- Chicken Restaurants, Duncanville
- Child Care & Day Care Services, Duncanville
- Child Related Social Services, Duncanville
- Chinese Restaurants, Duncanville
- Chiropractic Clinics, Duncanville
- Chiropractor, Duncanville
- Christian Churches, Duncanville
- Church Of Christ, Duncanville
- Church Of Jesus Christ Of Latter Day Saints, Duncanville
- Church Of The Nazarene, Duncanville
- Churches 1 Of 3, Duncanville
- Churches 2 Of 3, Duncanville
- Churches 3 Of 3, Duncanville
- Cigar, Cigarette & Tobacco Store & Supplies, Duncanville
- City & County Government, Duncanville
- City & County Law Enforcement, Duncanville
- Cleaning & Maintenance Services, Duncanville
- Cleaning Supplies, Systems & Equipment, Duncanville - Janitorial Supplies
- Clergy, Duncanville
- Clinics, Duncanville
- Clothing Stores, Duncanville - Clothes & Accessories
- CNC Machine Shop, Duncanville
- Coaching Business & Personal, Duncanville
- Collectibles, Duncanville
- Collection Agency Services, Duncanville
- Colleges & Universities, Duncanville
- Collision Repair & Services, Duncanville
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- Comic Book Stores, Duncanville
- Commercial & Industrial Laundry, Duncanville
- Commercial Equipment, Duncanville
- Commercial Furniture Repair & Reupholstery, Duncanville
- Commercial Printing, Duncanville
- Commercial Printing Manufacturers, Duncanville
- Communications Consultants, Duncanville
- Communications Services, Duncanville
- Community & Recreational Facilities, Duncanville
- Community Centers, Duncanville
- Community Church, Duncanville
- Community Churches, Duncanville
- Community Services, Duncanville
- Computer & Audio Visual Services, Duncanville
- Computer & Equipment Rental & Leasing, Duncanville
- Computer & Laptop Repair, Duncanville - PC Repair Services
- Computer & Software Stores, Duncanville
- Computer Repair, Duncanville
- Computer System Consultants, Duncanville - IT Consulting Services
- Computer System Designers & Consultants, Duncanville
- Construction, Duncanville
- Construction Companies, Duncanville
- Construction Services, Duncanville
- Consultants & Services, Duncanville
- Contact Lenses, Duncanville
- Contractors Supplies & Equipment, Duncanville
- Control Systems & Regulators, Duncanville
- Convenience Stores, Duncanville
- Cooking, Food & Beverage Equipment, Duncanville
- Cooling System & Parts, Duncanville - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Copier & Copy Machine Sales, Supplies, Service & Repair, Duncanville
- Copier & Copy Machine Supplies, Equipment & Parts, Duncanville
- Copying & Duplicating Services, Duncanville
- Cosmetics & Perfumes Outlets, Duncanville
- Cosmetics, Toiletries, Perfumes & Beauty Supply Stores, Duncanville
- Counseling Services, Duncanville
- County Police, Duncanville
- Courier Service, Duncanville
- Coverall Supplies & Services, Duncanville
- Crab House Restaurants, Duncanville
- Craft Supplies, Duncanville - Hobby & Craft Stores
- Credit & Debt Counseling Services, Duncanville
- Credit Card Merchant Services, Duncanville
- Credit Card Plan Services, Duncanville
- Credit Unions, Duncanville
- Cremation Services, Supplies & Equipment, Duncanville
- Custom Sewing & Alterations, Duncanville
- CV Joint & Axle, Duncanville
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