- Federal Government, Castleton
- Federated Church, Castleton
- Fencing - Fence Supplies & Materials, Castleton - Fence Companies
- Finance, Castleton
- Financial Institutions, Castleton
- Fire, Marine & Casualty Insurance, Castleton
- Fireplace & Chimney Cleaning & Repair Service, Castleton
- Fishing Tackle, Equipment & Supplies Stores, Castleton - Lures, Rods, Reels, Baits, Poles & Fishing Gear
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- Food & Beverage Stores & Services, Castleton
- Foundations, Clubs, Associations, Etcetera, Castleton
- Fraternal Organizations, Castleton
- Fuel Dealers & Gas Stations, Castleton
- Full Service Breakfast Restaurants, Castleton
- Funeral Services, Crematory & Cemetery, Castleton - Funeral Homes & Directors
- Furniture Stores, Castleton
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