- Federal Government, Southwest Harbor
- Ferries, Southwest Harbor
- Finance, Southwest Harbor
- Financial Institutions, Southwest Harbor
- Fire Department, Southwest Harbor
- Fire, Marine & Casualty Insurance, Southwest Harbor
- Fish & Seafood Markets, Wholesale & Retail, Southwest Harbor
- Fishing Tackle, Equipment & Supplies Stores, Southwest Harbor - Lures, Rods, Reels, Baits, Poles & Fishing Gear
- Fitness, Southwest Harbor
- Florists, Southwest Harbor - Flower Shops
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- Flowers & Plants, Southwest Harbor
- Food & Beverage Stores & Services, Southwest Harbor
- Food & Beverages - Wholesale & Retail, Southwest Harbor
- Food Services, Southwest Harbor
- Foundation Contractors, Southwest Harbor - Foundation Repair & Install
- Foundations, Clubs, Associations, Etcetera, Southwest Harbor
- Fuel, Southwest Harbor
- Fuel Dealers & Gas Stations, Southwest Harbor
- Furniture Stores, Southwest Harbor
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