- Family Medicine & General Practice Doctors, Rockford - General Practitioner (GP), Physicians & Surgeons
- Farm Equipment, Rockford
- Farms, Rockford
- Federal Government, Rockford
- Finance, Rockford
- Financial Institutions, Rockford
- Financial Services, Rockford
- Fire Department, Rockford
- Florists, Rockford - Flower Shops
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- Flowers & Plants, Rockford
- Food & Beverage Stores & Services, Rockford
- Food Processing Manufacturers, Rockford
- Food Product Manufacturers, Rockford
- Foundations, Clubs, Associations, Etcetera, Rockford
- Fraternal Organizations, Rockford
- Fuel Dealers & Gas Stations, Rockford
- Funeral Services, Crematory & Cemetery, Rockford - Funeral Homes & Directors
- Furniture Stores, Rockford
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