- Cabins Cottages & Chalet Rental, Ortonville
- Campgrounds, Ortonville
- Carpet, Rug & Linoleum Flooring Dealers, Ortonville
- Casual Dining Restaurants, Ortonville
- Caterers Food Services, Ortonville
- Catholic Churches, Ortonville
- Cellular & Mobile Phone Equipment & Systems Installation, Repair & Service, Ortonville
- Cellular & Mobile Phone Service, Ortonville
- Chambers Of Commerce, Ortonville
- Chiropractor, Ortonville
- Churches 1 Of 3, Ortonville
- Churches 2 Of 3, Ortonville
- City & County Administrative Agencies, Ortonville
- City & County Government, Ortonville
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- Clinics, Ortonville
- Coffee, Espresso & Tea House Restaurants, Ortonville
- Commercial Printing Manufacturers, Ortonville
- Communications Services, Ortonville
- Community & Recreational Facilities, Ortonville
- Community Services, Ortonville
- Construction, Ortonville
- Construction Services, Ortonville
- Consultants & Services, Ortonville
- Convenience Stores, Ortonville
- Convention & Meeting Facilities, Ortonville - Meeting Rooms
- Crushed Stone & Rock, Ortonville - Crushed Granite, Concrete, Gravel, etc
- Custom Parts & Accessories, Ortonville
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