- Fabrication Steel Manufacturers, Port Washington
- Family Medicine & General Practice Doctors, Port Washington - General Practitioner (GP), Physicians & Surgeons
- Family Services & Care, Port Washington
- Farm Equipment, Port Washington
- Fast Food Restaurants, Port Washington
- Fasteners & Miscellaneous Hardware Companies, Port Washington - Wholesale, Manufacturers & Suppliers
- Federal Government, Port Washington
- Finance, Port Washington
- Financial Advisory Services, Port Washington
- Financial Institutions, Port Washington
- Financial Management & Consulting, Port Washington
- Financial Planning Consultants, Port Washington
- Financial Services, Port Washington
- Finished Textiles Manufacturers, Port Washington
- Fireplace & Chimney Cleaning & Repair Service, Port Washington
- Fish & Seafood Markets, Wholesale & Retail, Port Washington
- Fishing & Hunting Guide Services, Port Washington
- Fishing Tackle Repair & Parts, Port Washington - Lures, Rods, Reels, Baits, Poles & Fishing Gear
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- Fishing Tackle, Equipment & Supplies Stores, Port Washington - Lures, Rods, Reels, Baits, Poles & Fishing Gear
- Fitness, Port Washington
- Fitness Centers, Port Washington
- Floor Machines Rental & Leasing, Port Washington
- Food & Beverage Stores & Services, Port Washington
- Food & Beverages - Wholesale & Retail, Port Washington
- Food Delivery Services, Port Washington
- Food Processing Equipment & Supplies , Port Washington
- Food Processing Manufacturers, Port Washington
- Food Product Manufacturers, Port Washington
- Food Service Equipment, Port Washington
- Food Services, Port Washington
- Foundations, Clubs, Associations, Etcetera, Port Washington
- Franchise Consultants, Port Washington
- Fuel, Port Washington
- Funeral Planning Services, Port Washington
- Funeral Services, Crematory & Cemetery, Port Washington - Funeral Homes & Directors
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