- Cabinets & Cabinet Hardware, Smithville
- Cabinets Refacing, Refinishing & Building, Smithville - Kitchen, Bathroom, Medicine, Storage & Custom Cabinets Contractors
- Campgrounds, Smithville
- Carpet, Rug & Linoleum Flooring Dealers, Smithville
- Casual Dining Restaurants, Smithville
- Catalog Services, Smithville
- Catalog, Mail-Order & Electronic Shopping, Smithville
- Catholic Churches, Smithville
- Chambers Of Commerce, Smithville
- Chemicals & Related Products, Smithville
- Child Care & Day Care Services, Smithville
- Chinese Grocery Stores, Smithville
- Chiropractic Clinics, Smithville
- Chiropractor, Smithville
- Christian Churches, Smithville
- Churches 1 Of 3, Smithville
- Churches 3 Of 3, Smithville
- City & County Government, Smithville
- Cleaning & Restoration Contractors, Including Sandblasting, Smithville
- Cleaning Supplies & Equipment, Smithville
- Clinics, Smithville
- Coating Engraving & Allied Services Manufacturing, Smithville
- Coffee, Smithville
- Coin Dealers & Supplies , Smithville
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- Combustibles & Explosives, Smithville
- Commercial Equipment, Smithville
- Commercial Printing, Smithville
- Commercial Printing Manufacturers, Smithville
- Community & Recreational Facilities, Smithville
- Community Services, Smithville
- Computer & Audio Visual Services, Smithville
- Computer & Laptop Repair, Smithville - PC Repair Services
- Computer & Software Stores, Smithville
- Computer Repair, Smithville
- Computer Software & Services, Smithville
- Computer Software Publishers & Developers, Smithville
- Computer Stores, Smithville
- Computer Stores - Other, Smithville
- Computer System Consultants, Smithville - IT Consulting Services
- Concrete Contractors, Smithville - Concrete Construction & Concrete Companies
- Concrete Repair, Restoration, Sealing & Cleaning, Smithville
- Construction, Smithville
- Consultants & Services, Smithville
- Convenience Stores, Smithville
- Cooking, Food & Beverage Equipment, Smithville
- Copying & Duplicating Services, Smithville
- Crane Rental & Leasing, Smithville
- Cranes Hoisting & Rigging Service, Smithville - Crane Rental Service
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