- Cafe Restaurants, Winthrop Harbor
- Carpenters, Winthrop Harbor - Carpentry Contractors
- Carpet Rug & Upholstery Cleaners, Winthrop Harbor
- Casual Dining Restaurants, Winthrop Harbor
- Central American Restaurants, Winthrop Harbor
- Churches 1 Of 3, Winthrop Harbor
- Cigar, Cigarette & Tobacco Store & Supplies, Winthrop Harbor
- City & County Government, Winthrop Harbor
- Cleaning & Maintenance Services, Winthrop Harbor
- CNC Machine Shop, Winthrop Harbor
- Coin Dealers & Supplies , Winthrop Harbor
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- Commercial & Industrial Photographers, Winthrop Harbor
- Commercial Equipment, Winthrop Harbor
- Communications Services, Winthrop Harbor
- Community Services, Winthrop Harbor
- Computer & Software Stores, Winthrop Harbor
- Computer Software & Services, Winthrop Harbor
- Construction, Winthrop Harbor
- Consultants & Services, Winthrop Harbor
- Convenience Stores, Winthrop Harbor
- Cruise Agents, Winthrop Harbor - Travel Agents
- Cruise Lines, Winthrop Harbor - Cruises
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