- Fabricated Metal Products Manufacturers, Port Jefferson Station
- Family Medicine & General Practice Doctors, Port Jefferson Station - General Practitioner (GP), Physicians & Surgeons
- Family Services & Care, Port Jefferson Station
- Farm Equipment, Port Jefferson Station
- Farms, Port Jefferson Station
- Fast Food Restaurants, Port Jefferson Station
- Fasteners & Miscellaneous Hardware Companies, Port Jefferson Station - Wholesale, Manufacturers & Suppliers
- Federal Economic And Regulatory Agencies, Port Jefferson Station
- Federal Government, Port Jefferson Station
- Fencing - Fence Supplies & Materials, Port Jefferson Station - Fence Companies
- Fiber & Corrugated Boxes, Port Jefferson Station
- Finance, Port Jefferson Station
- Financial Institutions, Port Jefferson Station
- Financial Planning Consultants, Port Jefferson Station
- Financial Services, Port Jefferson Station
- Fine Dining Restaurants, Port Jefferson Station
- Fire & Water Damage Restoration, Port Jefferson Station - Cleanup & Repair Service
- Fire Department, Port Jefferson Station
- Fire, Marine & Casualty Insurance, Port Jefferson Station
- First Aid Training, Port Jefferson Station
- Fish & Seafood Restaurants, Port Jefferson Station
- Fishing Tackle, Equipment & Supplies Stores, Port Jefferson Station - Lures, Rods, Reels, Baits, Poles & Fishing Gear
- Fitness, Port Jefferson Station
- Fitness Centers, Port Jefferson Station
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- Floor Refinishing, Installation & Resurfacing, Port Jefferson Station - Hardwood, Laminate Flooring
- Flooring Contractors, Port Jefferson Station - Laminate, Hardwood, Carpet, Tile, Vinyl, Linoleum, etc
- Flooring Materials & Supplies, Port Jefferson Station - Flooring Companies & Stores
- Flooring Stores & Dealers, Port Jefferson Station - Carpet Rugs, Hardwood Flooring, Laminate Flooring, Ceramic Tile, Vinyl Flooring, Area Rugs & More
- Florists, Port Jefferson Station - Flower Shops
- Flowers & Plants, Port Jefferson Station
- Food & Beverage Stores & Services, Port Jefferson Station
- Food & Beverages - Wholesale & Retail, Port Jefferson Station
- Food Delivery Services, Port Jefferson Station
- Food Services, Port Jefferson Station
- Forensic Consultants, Port Jefferson Station
- Foundations, Port Jefferson Station
- Foundations, Clubs, Associations, Etcetera, Port Jefferson Station
- Fraternal Organizations, Port Jefferson Station
- Freezers Sales, Service & Repair, Port Jefferson Station
- Fruit & Vegetable Juices, Port Jefferson Station - Juice Bars
- Fruit & Vegetable Markets, Wholesale & Retail, Port Jefferson Station
- Fuel, Port Jefferson Station
- Fuel Dealers & Gas Stations, Port Jefferson Station
- Full Service Breakfast Restaurants, Port Jefferson Station
- Funeral Information & Referral Services, Port Jefferson Station
- Funeral Services, Crematory & Cemetery, Port Jefferson Station - Funeral Homes & Directors
- Furniture Stores, Port Jefferson Station
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