- Fashion Designers, Irwindale
- Fast Food Restaurants, Irwindale
- Fasteners & Miscellaneous Hardware Companies, Irwindale - Wholesale, Manufacturers & Suppliers
- Fiber & Corrugated Boxes, Irwindale
- Finance, Irwindale
- Financial Institutions, Irwindale
- Financial Services, Irwindale
- Fire & Water Damage Restoration, Irwindale - Cleanup & Repair Service
- Fire, Marine & Casualty Insurance, Irwindale
- Fitness, Irwindale
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- Flood Control Equipment & Services, Irwindale
- Food & Beverage Stores & Services, Irwindale
- Food & Beverages - Wholesale & Retail, Irwindale
- Food Processing Equipment & Supplies , Irwindale
- Food Service Equipment, Irwindale
- Food Services, Irwindale
- Forklift Rental & Sales, Irwindale - Forklifts & Industrial Trucks
- Fuel, Irwindale
- Fuel Wholesale & Retail, Irwindale
- Full Service Breakfast Restaurants, Irwindale
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