- Cabinets & Cabinet Hardware, Postville
- Cable TV Companies & Services, Postville
- Car Detailing & Wash Service, Postville - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Postville
- Casual Dining Restaurants, Postville
- Catholic Churches, Postville
- Central American Restaurants, Postville
- Child Care & Day Care Services, Postville
- Child Related Social Services, Postville
- Chiropractor, Postville
- Churches 1 Of 3, Postville
- City & County Administrative Agencies, Postville
- City & County Government, Postville
- City & County Law Enforcement, Postville
- Clinics, Postville
- CNC Machine Shop, Postville
- Communications Services, Postville
- Community & Recreational Facilities, Postville
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- Community Centers, Postville
- Community Services, Postville
- Computer & Laptop Repair, Postville - PC Repair Services
- Computer & Software Stores, Postville
- Computer Repair, Postville
- Computer Stores, Postville
- Computer Stores - Other, Postville
- Concrete, Postville - Cement & Concrete Products, Suppliers, Companies
- Concrete & Cement, Postville
- Concrete Contractors, Postville - Concrete Construction & Concrete Companies
- Concrete Product Manufacturers, Postville
- Construction, Postville
- Convenience Stores, Postville
- County Police, Postville
- Crane Services, Postville
- Cranes Hoisting & Rigging Service, Postville - Crane Rental Service
- Crushed Stone & Rock, Postville - Crushed Granite, Concrete, Gravel, etc
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