- Candy, Nut & Confectionery Wholesale & Retail, Omro - Candy Stores
- Car Alarms & Security Systems, Omro - Remote Car Starter, etc
- Car Detailing & Wash Service, Omro - Auto Detailing
- Car Wash, Cleaning, Wax & Polish Service, Omro
- Carnivals, Fairs & Exhibitions, Omro
- Carpenters, Omro - Carpentry Contractors
- Carpentry Framing Contractors, Omro - House Framing - Install & Repair
- Cars, Truck, Van & SUV Car Dealerships, Omro - Auto Dealers
- Casual Dining Restaurants, Omro
- Catholic Churches, Omro
- Central American Restaurants, Omro
- Child Care & Day Care Services, Omro
- Chinese Restaurants, Omro
- Chiropractor, Omro
- Churches 1 Of 3, Omro
- City & County Government, Omro
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- Clinics, Omro
- CNC Machine Shop, Omro
- Commercial Equipment, Omro
- Commercial Printing Manufacturers, Omro
- Community & Recreational Facilities, Omro
- Community Centers, Omro
- Community Services, Omro
- Concrete Contractors, Omro - Concrete Construction & Concrete Companies
- Construction, Omro
- Construction & Civil Engineer, Omro
- Construction Companies, Omro
- Consultants & Services, Omro
- Convenience Stores, Omro
- Conveyor & Conveying Equipment, Omro - Conveyor Belt
- Cremation Services, Supplies & Equipment, Omro
- Crushed Stone & Rock, Omro - Crushed Granite, Concrete, Gravel, etc
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