- Cabins Cottages & Chalet Rental, Summerland Key
- Campers & Pick-Up Canopies Parts & Supplies, Summerland Key
- Campgrounds, Summerland Key
- Car Tune Up Service, Summerland Key - Auto Tune Up
- Carpet, Rug & Linoleum Flooring Dealers, Summerland Key
- Casual Dining Restaurants, Summerland Key
- Caterers Food Services, Summerland Key
- Ceiling Contractors, Summerland Key - Ceilings
- Child Care & Day Care Services, Summerland Key
- Churches 1 Of 3, Summerland Key
- Churches 2 Of 3, Summerland Key
- City & County Administrative Agencies, Summerland Key
- City & County Government, Summerland Key
- Clinics, Summerland Key
- Commercial Printing Manufacturers, Summerland Key
- Communications Services, Summerland Key
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- Community Services, Summerland Key
- Computer & Audio Visual Services, Summerland Key
- Computer & Laptop Repair, Summerland Key - PC Repair Services
- Computer & Software Stores, Summerland Key
- Computer Programming & Software Development Services, Summerland Key
- Computer Repair, Summerland Key
- Computer Software & Services, Summerland Key
- Computer Software Service, Summerland Key
- Concrete Contractors, Summerland Key - Concrete Construction & Concrete Companies
- Concrete Repair, Restoration, Sealing & Cleaning, Summerland Key
- Construction, Summerland Key
- Construction Services, Summerland Key
- Consultants & Services, Summerland Key
- Convenience Stores, Summerland Key
- Counseling Services, Summerland Key
- Crab House Restaurants, Summerland Key
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