- Cabins Cottages & Chalet Rental, Mackinaw City
- Campgrounds, Mackinaw City
- Candy, Nut & Confectionery Wholesale & Retail, Mackinaw City - Candy Stores
- Car Detailing & Wash Service, Mackinaw City - Auto Detailing
- Casual Dining Restaurants, Mackinaw City
- Caterers Food Services, Mackinaw City
- Catholic Churches, Mackinaw City
- Chambers Of Commerce, Mackinaw City
- Chocolate & Cocoa, Mackinaw City
- Churches 1 Of 3, Mackinaw City
- Churches 2 Of 3, Mackinaw City
- City & County Administrative Agencies, Mackinaw City
- City & County Government, Mackinaw City
- Clinics, Mackinaw City
- Clothing Stores, Mackinaw City - Clothes & Accessories
- Coffee & Tea Stores, Mackinaw City
- Coffee, Espresso & Tea House Restaurants, Mackinaw City
- Commercial Printing, Mackinaw City
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- Commercial Printing Manufacturers, Mackinaw City
- Community & Recreational Facilities, Mackinaw City
- Community Services, Mackinaw City
- Computer & Software Stores, Mackinaw City
- Computer Repair, Mackinaw City
- Computer Software & Services, Mackinaw City
- Computer Software Service, Mackinaw City
- Construction, Mackinaw City
- Construction Services, Mackinaw City
- Consultants & Services, Mackinaw City
- Convention & Meeting Facilities, Mackinaw City - Meeting Rooms
- Convention & Visitor Information & Bureaus, Mackinaw City - Tourist Information Centers
- Convention Services - Other, Mackinaw City
- Cookies, Mackinaw City
- Country Cooking Restaurants, Mackinaw City
- Credit Unions, Mackinaw City
- Custom Sewing & Alterations, Mackinaw City
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