- Fabric Stores, New Canaan
- Family Services & Care, New Canaan
- Farm Equipment, New Canaan
- Farm Equipment Wholesale, New Canaan
- Faux Painting, New Canaan - Faux Finish Painting
- Federal Administrative Agencies, New Canaan
- Federal Government, New Canaan
- Fences & Animal Enclosure Contractors, New Canaan
- Fencing - Fence Contractors, New Canaan - Fence Installation & Repair - Wood, Metal, Vinyl & Wrought Iron Fences
- Fencing - Fence Supplies & Materials, New Canaan - Fence Companies
- Fiber & Corrugated Boxes, New Canaan
- Film Production Services, New Canaan
- Finance, New Canaan
- Financial Advisory Services, New Canaan
- Financial Institutions, New Canaan
- Financial Management & Consulting, New Canaan
- Financial Planning Consultants, New Canaan
- Financial Services, New Canaan
- Fine Arts Schools, New Canaan
- Fire, Marine & Casualty Insurance, New Canaan
- Fish & Seafood Markets, Wholesale & Retail, New Canaan
- Fish Stores, New Canaan
- Fitness, New Canaan
- Fitness Centers, New Canaan
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- Floor Cleaning, Waxing & Polishing, New Canaan - Floor Care & Cleaning Service
- Floor Refinishing, Installation & Resurfacing, New Canaan - Hardwood, Laminate Flooring
- Flooring Contractors, New Canaan - Laminate, Hardwood, Carpet, Tile, Vinyl, Linoleum, etc
- Flooring Materials & Supplies, New Canaan - Flooring Companies & Stores
- Flooring Stores & Dealers, New Canaan - Carpet Rugs, Hardwood Flooring, Laminate Flooring, Ceramic Tile, Vinyl Flooring, Area Rugs & More
- Florists, New Canaan - Flower Shops
- Flowers & Plants, New Canaan
- Food & Beverage Stores & Services, New Canaan
- Food & Beverages - Wholesale & Retail, New Canaan
- Food Management Services, New Canaan
- Food Services, New Canaan
- Footwear Manufacturers, New Canaan
- Foreign Auto Repair & Service, New Canaan
- Foundations, Clubs, Associations, Etcetera, New Canaan
- Franchise Consultants, New Canaan
- Fraternal Organizations, New Canaan
- Fuel, New Canaan
- Fuel Dealers & Gas Stations, New Canaan
- Full Service Breakfast Restaurants, New Canaan
- Funeral Information & Referral Services, New Canaan
- Funeral Services, Crematory & Cemetery, New Canaan - Funeral Homes & Directors
- Furnished Apartments, New Canaan
- Furniture Repair & Refinishing, New Canaan
- Furniture Stores, New Canaan
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