- Family Medicine & General Practice Doctors, Alton - General Practitioner (GP), Physicians & Surgeons
- Federal Administrative Agencies, Alton
- Federal Government, Alton
- Finance, Alton
- Financial Institutions, Alton
- Financial Planning Consultants, Alton
- Financial Services, Alton
- Fire Department, Alton
- Fireplace & Chimney Cleaning & Repair Service, Alton
- Fish & Seafood Restaurants, Alton
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- Food & Beverage Stores & Services, Alton
- Food Delivery Services, Alton
- Food Services, Alton
- Formal Wear Rental, Alton
- Formal Wear Services, Alton
- Foundations, Clubs, Associations, Etcetera, Alton
- Fraternal Organizations, Alton
- Full Service Breakfast Restaurants, Alton
- Funeral Services, Crematory & Cemetery, Alton - Funeral Homes & Directors
- Furniture Stores, Alton
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