- Cafe Restaurants, Unionville
- Campgrounds, Unionville
- Carpenters, Unionville - Carpentry Contractors
- Carpet & Carpet Equipment & Supplies Dealers, Unionville
- Carpet & Rugs Repair & Binding, Unionville
- Carpet Rug & Upholstery Cleaners, Unionville
- Casual Dining Restaurants, Unionville
- Caterers Food Services, Unionville
- Cellular & Mobile Phone Service, Unionville
- Charitable & Non-Profit Organizations, Unionville
- Check Printing Manufacturers, Unionville
- Children's Clothing Stores, Unionville - Infant, Babies & Kids Clothing
- Chinese Restaurants, Unionville
- Churches 1 Of 3, Unionville
- City & County Government, Unionville
- Cleaning & Maintenance Services, Unionville
- Cleaning & Restoration Contractors, Including Sandblasting, Unionville
- Coffee, Unionville
- Coffee, Espresso & Tea House Restaurants, Unionville
- Commercial Printing Manufacturers, Unionville
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- Communications Services, Unionville
- Community Services, Unionville
- Computer & Laptop Repair, Unionville - PC Repair Services
- Computer & Software Stores, Unionville
- Computer Repair, Unionville
- Computer Software & Services, Unionville
- Computer Software Service, Unionville
- Concrete Contractors, Unionville - Concrete Construction & Concrete Companies
- Congregational Church, Unionville
- Construction, Unionville
- Consultants & Services, Unionville
- Convenience Stores, Unionville
- Cosmetology School, Unionville
- Credit Reporting Agencies, Unionville
- Cruise Agents, Unionville - Travel Agents
- Cruise Lines, Unionville - Cruises
- Curb & Sidewalk Contractors, Unionville
- Custom Sewing & Alterations, Unionville
- Customer Service Representatives, Unionville
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