- Fabric Stores, Mattituck
- Family Medicine & General Practice Doctors, Mattituck - General Practitioner (GP), Physicians & Surgeons
- Farm Equipment, Mattituck
- Farms, Mattituck
- Federal Administrative Agencies, Mattituck
- Federal Government, Mattituck
- Fencing - Fence Supplies & Materials, Mattituck - Fence Companies
- Finance, Mattituck
- Financial Institutions, Mattituck
- Financial Planning Consultants, Mattituck
- Financial Services, Mattituck
- Fish & Seafood Restaurants, Mattituck
- Fishing Tackle Repair & Parts, Mattituck - Lures, Rods, Reels, Baits, Poles & Fishing Gear
- Fishing Tackle, Equipment & Supplies Stores, Mattituck - Lures, Rods, Reels, Baits, Poles & Fishing Gear
- Fitness, Mattituck
- Flooring Stores & Dealers, Mattituck - Carpet Rugs, Hardwood Flooring, Laminate Flooring, Ceramic Tile, Vinyl Flooring, Area Rugs & More
- Florist Supplies & Equipment, Mattituck
- Florists, Mattituck - Flower Shops
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- Flowers & Plants, Mattituck
- Food & Beverage Stores & Services, Mattituck
- Food & Beverages - Wholesale & Retail, Mattituck
- Food Product Manufacturers, Mattituck
- Food Services, Mattituck
- Foundation Contractors, Mattituck - Foundation Repair & Install
- Foundations, Clubs, Associations, Etcetera, Mattituck
- Fruit & Vegetable Markets, Wholesale & Retail, Mattituck
- Fuel, Mattituck
- Fuel Dealers & Gas Stations, Mattituck
- Funeral Information & Referral Services, Mattituck
- Funeral Planning Services, Mattituck
- Funeral Services, Crematory & Cemetery, Mattituck - Funeral Homes & Directors
- Furniture Repair, Mattituck
- Furniture Repair & Refinishing, Mattituck
- Furniture Reupholstery & Repair, Mattituck
- Furniture Stores, Mattituck
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