- Machinery, Supplies & Equipment - Business Production Related, Summerland Key
- Mail Delivery Service, Summerland Key
- Mailing, Delivery & Courier Service, Summerland Key
- Major Appliances, Summerland Key - Household & Kitchen
- Management Consultants & Services, Summerland Key
- Manufacturing, Summerland Key
- Marinas & Marina Services, Summerland Key
- Marine Animals & Fish, Summerland Key
- Marine Contractors & Designers, Summerland Key
- Marine Products And Services, Summerland Key
- Marine Repair & Service Stations, Summerland Key
- Marine Salvage & Wrecking Services, Summerland Key
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- Marine Supplies & Equipment, Summerland Key - Boat Supplies
- Marine Supplies & Equipment Repair, Summerland Key - Boat Supplies & Equipment
- Meat Market, Wholesale & Products, Summerland Key
- Miscellaneous Business Services, Summerland Key
- Miscellaneous Government, Summerland Key
- Miscellaneous Personal Services, Summerland Key
- Mobile Homes for Rent & Lease, Summerland Key
- Mortgage Bankers & Correspondents, Summerland Key
- Motor Vehicle, Summerland Key
- Motor Vehicle Rental & Leasing, Summerland Key
- Moving Supplies & Equipment Rental, Summerland Key
- Moving Truck Rental , Summerland Key
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