- Cafe Restaurants, Sinton
- Camper, Rvs & Travel Trailer Dealers, Sinton
- Campgrounds, Sinton
- Cancer Educational, Referral & Support Service Centers, Sinton
- Cancer Treatment & Information Services , Sinton
- Car Detailing & Wash Service, Sinton - Auto Detailing
- Car Rental, Sinton - Rental Cars & Lease Service
- Caskets Burial, Sinton
- Casual Dining Restaurants, Sinton
- Catholic Churches, Sinton
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Sinton
- Cellular & Mobile Phone Service, Sinton
- Central American Restaurants, Sinton
- Chambers Of Commerce, Sinton
- Check Cashing Services, Sinton
- Chicken Restaurants, Sinton
- Child Care & Day Care Services, Sinton
- Child Related Social Services, Sinton
- Chinese Restaurants, Sinton
- Christian Churches, Sinton
- Church Of Christ, Sinton
- Church Of God, Sinton
- Churches 1 Of 3, Sinton
- City & County Administrative Agencies, Sinton
- City & County Government, Sinton
- City & County Law Enforcement, Sinton
- Cleaning & Restoration Contractors, Including Sandblasting, Sinton
- Clinics, Sinton
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- Clothing Stores, Sinton - Clothes & Accessories
- CNC Machine Shop, Sinton
- Commercial & Industrial Laundry, Sinton
- Commercial Equipment, Sinton
- Commercial Printing Manufacturers, Sinton
- Communications Consultants, Sinton
- Communications Services, Sinton
- Community & Recreational Facilities, Sinton
- Community Centers, Sinton
- Community Services, Sinton
- Concrete, Sinton - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Sinton
- Concrete Product Manufacturers, Sinton
- Construction, Sinton
- Construction & Civil Engineer, Sinton
- Construction Companies, Sinton
- Construction Services, Sinton
- Consultants & Services, Sinton
- Convenience Stores, Sinton
- Cooling System & Parts, Sinton - Antifreeze, Radiator, Water Pump, Fan, Hoses, Belts, etc
- Cotton Ginning Equipment & Supplies, Sinton
- Country Stores, Sinton
- County Police, Sinton
- Credit Unions, Sinton
- Cremation Services, Supplies & Equipment, Sinton
- Crop Planting & Protecting, Sinton - Soil Preparation & Cultivating
- Crude Petroleum & Natural Gas, Sinton
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