- Machine Shop, Fairfield
- Machine Shop & Tool Repair Service, Fairfield
- Machine Tool Repair & Rebuild, Fairfield
- Machine Tools , Fairfield
- Machinery And Equipment Manufacturers, Fairfield
- Machinery Custom Design Manufacturers, Fairfield
- Machinery, Supplies & Equipment - Business Production Related, Fairfield
- Machinery, Supplies & Equipment - Business Supplies Related, Fairfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fairfield
- Magazine & Newspaper Stands, Fairfield - Dealers & Distributors
- Magnetic & Optical Recording Media Manufacturers, Fairfield
- Magnetic Devices, Fairfield
- Magnets & Magnetic Devices, Fairfield
- Mailing, Delivery & Courier Service, Fairfield
- Major Appliances, Fairfield - Household & Kitchen
- Make Up & Cosmetics Application, Fairfield
- Make Up Masquerade & Theatrical, Fairfield
- Management Consultants & Services, Fairfield
- Manicurists & Pedicurists, Fairfield
- Manufacturers Agents & Representatives, Fairfield
- Manufacturers Representative, Fairfield - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Fairfield
- Manufacturing & Industrial Consultants, Fairfield
- Manufacturing Products, Fairfield
- Manufacturing Services, Fairfield
- Marble, Fairfield
- Marble Tile, Fairfield
- Marine Supplies & Equipment, Fairfield - Boat Supplies
- Market Research & Analysis , Fairfield - Market Analysis, Business & Economic Research
- Marketing Consultants Professional Practices, Fairfield
- Martial Arts & Self Defense Schools, Fairfield
- Masonry Contractors, Fairfield - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Fairfield
- Massage Therapists & Professional, Fairfield
- Massage Therapy, Fairfield
- Material Handling & Heavy Machinery & Equipment, Fairfield
- Material Handling Equipment, Fairfield - Conveyor Belt, Pallet Jack, Forklift, etc
- Mathematicians, Fairfield
- Mats & Matting, Fairfield
- Meat Market, Wholesale & Products, Fairfield
- Mechanical Contractors, Fairfield - Install, Service & Repair
- Medical & Dental Management, Fairfield
- Medical & Health Service Organizations, Fairfield
- Medical Billing Services, Fairfield
- Medical Equipment Manufacturers, Fairfield
- Medical Supplies & Equipment, Fairfield
- Mediterranean Restaurants, Fairfield
- Men's & Boys Clothing & Accessories Stores, Fairfield
- Men's Clothing Stores, Fairfield - Clothes & Accessories
- Mens & Boys Hats, Gloves & Neckwear, Fairfield
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- Mental Health Specialists, Fairfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Fairfield
- Messenger Service, Fairfield - Message Receiving & Forwarding Service
- Metal Boxes & Containers, Fairfield
- Metal Finishers, Fairfield
- Metal Pails, Drums & Barrel Manufacturers, Fairfield
- Metal Plating & Polishing, Fairfield
- Metal Repair Service & Blacksmith, Fairfield - Iron Works
- Metal Specialties, Fairfield
- Metal Working Machinery, Fairfield
- Methodist Church, Fairfield
- Mexican Restaurants, Fairfield
- Microfilm & Imaging Service, Equipment & Supplies , Fairfield
- Mini & Self Storage, Fairfield
- Mini Golf Courses, Fairfield
- Mining, Fairfield
- Mirrors, Fairfield - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Fairfield
- Miscellaneous Business Services, Fairfield
- Miscellaneous Government, Fairfield
- Miscellaneous Industry, Fairfield
- Miscellaneous Manufacturing, Fairfield
- Miscellaneous Personal Services, Fairfield
- Miscellaneous Photographers, Fairfield
- Miscellaneous Professional, Fairfield
- Modeling & Talent Agencies, Fairfield
- Modular & Mobile Homes For Sale, Fairfield - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Fairfield
- Mosquito Control, Fairfield
- Motion Picture & Television Production Services, Fairfield
- Motion Picture Pre & Post Production Services, Fairfield
- Motor Vehicle, Fairfield
- Motor Vehicle Rental & Leasing, Fairfield
- Motorcycle & Motor Scooters Dealers, Repair & Service, Fairfield
- Motorcycle Parts, Accessories & Dealers, Fairfield
- Motorcycle Repair & Service, Fairfield
- Moving & Storage Supplies & Equipment, Fairfield
- Moving Companies, Fairfield
- Moving Supplies & Equipment Rental, Fairfield
- Moving Truck Rental , Fairfield
- Mulch, Peat & Moss Products, Fairfield
- Museums, Fairfield
- Music, Fairfield
- Music Lessons, Fairfield
- Music Lessons - Instrumental, Fairfield
- Musical Instrument Rental, Fairfield - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Fairfield
- Musical Instruments Repair, Sales & Service, Fairfield
- Musical Recording Services, Fairfield
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