- Fabric Processing, Holtsville
- Facial Skin Care & Treatments, Holtsville
- Family Law & Divorce Attorneys & Lawyers, Holtsville
- Family Law & Divorce Lawyers & Attorneys, Holtsville
- Family Services & Care, Holtsville
- Fasteners & Miscellaneous Hardware Companies, Holtsville - Wholesale, Manufacturers & Suppliers
- Favors & Souvenirs, Holtsville
- Federal Administrative Agencies, Holtsville
- Federal Government, Holtsville
- Fences & Animal Enclosure Contractors, Holtsville
- Fencing - Fence Contractors, Holtsville - Fence Installation & Repair - Wood, Metal, Vinyl & Wrought Iron Fences
- Fencing - Fence Supplies & Materials, Holtsville - Fence Companies
- Finance, Holtsville
- Financial Planning Consultants, Holtsville
- Financial Services, Holtsville
- Finished Textiles Manufacturers, Holtsville
- Fireplace Accessories, Equipment, Tools & Decor, Holtsville - Gas & Electric Fireplace
- Fireplace Manufacturers, Holtsville
- Fitness, Holtsville
- Fitness Centers, Holtsville
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- Floor Refinishing, Installation & Resurfacing, Holtsville - Hardwood, Laminate Flooring
- Flooring Contractors, Holtsville - Laminate, Hardwood, Carpet, Tile, Vinyl, Linoleum, etc
- Flooring Materials & Supplies, Holtsville - Flooring Companies & Stores
- Food, Holtsville
- Food & Beverage Stores & Services, Holtsville
- Food & Beverages - Wholesale & Retail, Holtsville
- Food Product Manufacturers, Holtsville
- Food Services, Holtsville
- Football Clubs & Instruction, Holtsville
- Forestry & Lumbering, Holtsville
- Foundations, Clubs, Associations, Etcetera, Holtsville
- Frozen Foods - Wholesale & Retail, Holtsville
- Fruit & Vegetable Markets, Wholesale & Retail, Holtsville
- Fuel, Holtsville
- Fuel Dealers & Gas Stations, Holtsville
- Full Service Breakfast Restaurants, Holtsville
- Furniture Repair, Holtsville
- Furniture Repair & Refinishing, Holtsville
- Furniture Reupholstery & Repair, Holtsville
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