- Fabric Stores, Duncansville
- Factory Outlet Stores, Duncansville
- Family Medicine & General Practice Doctors, Duncansville - General Practitioner (GP), Physicians & Surgeons
- Fast Food Restaurants, Duncansville
- Fasteners & Miscellaneous Hardware Companies, Duncansville - Wholesale, Manufacturers & Suppliers
- Federal Administrative Agencies, Duncansville
- Federal Government, Duncansville
- Finance, Duncansville
- Financial Advisory Services, Duncansville
- Financial Institutions, Duncansville
- Financial Insurance, Duncansville
- Financial Management & Consulting, Duncansville
- Financial Planning Consultants, Duncansville
- Financial Services, Duncansville
- Fire & Water Damage Restoration, Duncansville - Cleanup & Repair Service
- Fire Alarm Systems, Duncansville
- Fire, Marine & Casualty Insurance, Duncansville
- Fireplace Accessories, Equipment, Tools & Decor, Duncansville - Gas & Electric Fireplace
- Fish & Seafood Markets, Wholesale & Retail, Duncansville
- Fish & Seafood Restaurants, Duncansville
- Fishing Tackle, Equipment & Supplies Stores, Duncansville - Lures, Rods, Reels, Baits, Poles & Fishing Gear
- Fitness, Duncansville
- Fitness Centers, Duncansville
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- Flatbed & Cargo Trailers, Duncansville - New & Used Trailer, Parts & Dealers
- Flea Markets, Duncansville
- Float Trips, Duncansville
- Flooring Consultants, Duncansville
- Flooring Materials & Supplies, Duncansville - Flooring Companies & Stores
- Flooring Materials & Supplies, Duncansville
- Flooring Stores & Dealers, Duncansville - Carpet Rugs, Hardwood Flooring, Laminate Flooring, Ceramic Tile, Vinyl Flooring, Area Rugs & More
- Food & Beverage Stores & Services, Duncansville
- Food & Beverages - Wholesale & Retail, Duncansville
- Food Delivery Services, Duncansville
- Food Services, Duncansville
- Foster Care Services, Duncansville
- Foundations, Clubs, Associations, Etcetera, Duncansville
- Foundries Other Metals, Duncansville
- Fraternal Organizations, Duncansville
- Freight Forwarder, Duncansville - Freight Forwarding
- Fuel, Duncansville
- Fuel Dealers & Gas Stations, Duncansville
- Full Service Breakfast Restaurants, Duncansville
- Functions Related To Deposit Banking, Duncansville
- Funeral Services, Crematory & Cemetery, Duncansville - Funeral Homes & Directors
- Furniture Repair & Refinishing, Duncansville
- Furniture Stores, Duncansville
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