- Fabric Processing, Frederick
- Fabric Stores, Frederick
- Fabrication Steel Manufacturers, Frederick
- Facial Skin Care & Treatments, Frederick
- Factory Outlet Stores, Frederick
- Fairgrounds, Frederick
- Family Crisis Services, Frederick
- Family Law & Divorce Attorneys & Lawyers, Frederick
- Family Law & Divorce Lawyers & Attorneys, Frederick
- Family Medicine & General Practice Doctors, Frederick - General Practitioner (GP), Physicians & Surgeons
- Family Planning & Birth Control Services, Frederick - Family Planning Clinic
- Family Planning And Alternatives, Frederick
- Family Restaurants, Frederick
- Family Services & Care, Frederick
- Fan & Blower Parts Wholesale, Frederick
- Farm & Agricultural Trailers, Frederick
- Farm Equipment, Frederick
- Farm Equipment Repair, Frederick
- Farm Financial Services, Frederick
- Farm Produce Storage & Warehouse, Frederick - Warehousing
- Farming Gardens, Frederick
- Farms, Frederick
- Fashion Designers, Frederick
- Fast Food Restaurants, Frederick
- Fasteners & Miscellaneous Hardware Companies, Frederick - Wholesale, Manufacturers & Suppliers
- Fax Machines, Equipment & Supplies , Frederick
- Fax Service, Frederick
- Federal Administrative Agencies, Frederick
- Federal Economic And Regulatory Agencies, Frederick
- Federal Government, Frederick
- Feeders Automatic Animal & Fish, Frederick
- Fence Railings, Frederick - Fence Rails
- Fences & Animal Enclosure Contractors, Frederick
- Fencing - Fence Contractors, Frederick - Fence Installation & Repair - Wood, Metal, Vinyl & Wrought Iron Fences
- Fencing - Fence Supplies & Materials, Frederick - Fence Companies
- Fertilizers & Agricultural Chemicals & Pesticides, Frederick
- Fiber & Corrugated Boxes, Frederick
- Finance, Frederick
- Financial Advisory Services, Frederick
- Financial Consulting Services, Frederick
- Financial Institutions, Frederick
- Financial Insurance, Frederick
- Financial Management & Consulting, Frederick
- Financial Planning Consultants, Frederick
- Financial Services, Frederick
- Financing Personal, Frederick
- Fine Arts Schools, Frederick
- Fine Dining Restaurants, Frederick
- Finished Textiles Manufacturers, Frederick
- Fire & Water Damage Restoration, Frederick - Cleanup & Repair Service
- Fire Alarm & Safety Equipment, Frederick
- Fire Alarm Systems, Frederick
- Fire Department, Frederick
- Fire Extinguishers, Frederick
- Fire Extinguishers, Frederick
- Fire Protection & Prevention Consultants, Frederick
- Fire Protection Services, Frederick - Fire Alarm, Extinguishers, Etc
- Fire Protection Systems & Service, Frederick
- Fire, Marine & Casualty Insurance, Frederick
- Firefighting Equipment & Supplies, Frederick
- Fireplace & Chimney Cleaning & Repair Service, Frederick
- Fireplace Accessories, Equipment, Tools & Decor, Frederick - Gas & Electric Fireplace
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- Fish & Seafood Markets, Wholesale & Retail, Frederick
- Fish & Seafood Restaurants, Frederick
- Fishing Tackle Repair & Parts, Frederick - Lures, Rods, Reels, Baits, Poles & Fishing Gear
- Fitness, Frederick
- Fitness Centers, Frederick
- Fittings, Frederick
- Flatbed & Cargo Trailers, Frederick - New & Used Trailer, Parts & Dealers
- Flight Instruction Schools, Frederick
- Floor Cleaning, Waxing & Polishing, Frederick - Floor Care & Cleaning Service
- Floor Refinishing, Installation & Resurfacing, Frederick - Hardwood, Laminate Flooring
- Flooring Contractors, Frederick - Laminate, Hardwood, Carpet, Tile, Vinyl, Linoleum, etc
- Flooring Materials & Supplies, Frederick - Flooring Companies & Stores
- Flooring Materials & Supplies, Frederick
- Flooring Stores & Dealers, Frederick - Carpet Rugs, Hardwood Flooring, Laminate Flooring, Ceramic Tile, Vinyl Flooring, Area Rugs & More
- Florists, Frederick - Flower Shops
- Flowers & Plants, Frederick
- Flux & Metal Powders Manufacturers, Frederick
- Food & Beverage Stores & Services, Frederick
- Food & Beverages - Wholesale & Retail, Frederick
- Food Brokers, Frederick
- Food Brokers & Manufacturing Agents, Frederick
- Food Delivery Services, Frederick
- Food Management Services, Frederick
- Food Product Manufacturers, Frederick
- Food Services, Frederick
- Footwear Manufacturers, Frederick
- Foreign Auto Repair & Service, Frederick
- Formal Wear Rental, Frederick
- Formal Wear Services, Frederick
- Foster Care Services, Frederick
- Foundation Contractors, Frederick - Foundation Repair & Install
- Foundations, Frederick
- Foundations, Clubs, Associations, Etcetera, Frederick
- Foursquare Gospel Church, Frederick
- Fraternal Organizations, Frederick
- Freight Forwarder, Frederick - Freight Forwarding
- Friends Church, Frederick
- Frozen Foods - Wholesale & Retail, Frederick
- Fruit & Vegetable Juices, Frederick - Juice Bars
- Fruit & Vegetable Markets, Wholesale & Retail, Frederick
- Fuel, Frederick
- Fuel Bulk Delivery Services, Frederick
- Fuel Dealers & Gas Stations, Frederick
- Full Service Breakfast Restaurants, Frederick
- Functions Related To Deposit Banking, Frederick
- Fund Raising Service, Consultants & Organizations, Frederick
- Fundraising Games, Merchandise & Supplies, Frederick
- Funeral Planning Services, Frederick
- Funeral Services, Crematory & Cemetery, Frederick - Funeral Homes & Directors
- Funeral Supplies, Frederick
- Fur & Leather Goods & Products, Frederick - Jackets, Coats, Vest, Clothes & Accessories
- Furniture Accessories, Frederick
- Furniture Cleaning Commercial & Industrial, Frederick
- Furniture Design, Frederick
- Furniture Manufacturers, Frederick
- Furniture Rental & Leasing, Frederick - Appliance Furniture & Decor Items
- Furniture Repair, Frederick
- Furniture Repair & Refinishing, Frederick
- Furniture Reupholstery & Repair, Frederick
- Furniture Stores, Frederick
- Furniture Stores - More, Frederick
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