- Fabricated Metal Products Manufacturers, Frederick
- Family Services & Care, Frederick
- Federal Economic And Regulatory Agencies, Frederick
- Federal Government, Frederick
- Fiberglass Supplies, Materials & Products, Frederick
- Finance, Frederick
- Financial Services, Frederick
- Fire Alarm & Safety Equipment, Frederick
- Fitness, Frederick
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- Flatbed & Cargo Trailers, Frederick - New & Used Trailer, Parts & Dealers
- Florists, Frederick - Flower Shops
- Flowers & Plants, Frederick
- Food & Beverage Stores & Services, Frederick
- Foundations, Clubs, Associations, Etcetera, Frederick
- Freezers Sales, Service & Repair, Frederick
- Furniture Repair, Frederick
- Furniture Repair & Refinishing, Frederick
- Furniture Reupholstery & Repair, Frederick
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