- Fabric Stores, Frederick
- Fabricated Metal Products Manufacturers, Frederick
- Family Medicine & General Practice Doctors, Frederick - General Practitioner (GP), Physicians & Surgeons
- Farm & Ranch Management Services, Frederick - Farm Labor
- Farm Equipment, Frederick
- Farms, Frederick
- Federal Administrative Agencies, Frederick
- Federal Government, Frederick
- Finance, Frederick
- Financial Institutions, Frederick
- Financial Services, Frederick
- Financing Personal, Frederick
- Fire Department, Frederick
- Fire, Marine & Casualty Insurance, Frederick
- Fishing & Hunting Camps, Frederick
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- Fishing & Hunting Guide Services, Frederick
- Fitness, Frederick
- Fitness Centers, Frederick
- Florists, Frederick - Flower Shops
- Flowers & Plants, Frederick
- Food & Beverage Stores & Services, Frederick
- Food & Beverages - Wholesale & Retail, Frederick
- Food Services, Frederick
- Foundations, Clubs, Associations, Etcetera, Frederick
- Freight Forwarder, Frederick - Freight Forwarding
- Fuel, Frederick
- Funeral Planning Services, Frederick
- Funeral Services, Crematory & Cemetery, Frederick - Funeral Homes & Directors
- Funeral Supplies, Frederick
- Furniture Stores, Frederick
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