- Machine Shop, Fairfield
- Machine Shop & Tool Repair Service, Fairfield
- Machinery Movers & Erectors, Fairfield
- Machinery, Supplies & Equipment - Business Production Related, Fairfield
- Machinery, Supplies & Equipment - Business Supplies Related, Fairfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fairfield
- Magazine Ads, Fairfield - Periodical Advertising
- Mail Delivery Service, Fairfield
- Maintenance, Cleaning & Sanitation, Fairfield
- Major Appliances, Fairfield - Household & Kitchen
- Management Consultants & Services, Fairfield
- Manicurists & Pedicurists, Fairfield
- Manufacturers Agents & Representatives, Fairfield
- Manufacturers Representative, Fairfield - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Fairfield
- Manufacturing Products, Fairfield
- Marble Contractors, Fairfield - Installation, Cleaning & Removal Services
- Marriage & Family Counselors, Fairfield
- Martial Arts & Self Defense Schools, Fairfield
- Masonry Materials & Supplies, Fairfield
- Massage Therapists & Professional, Fairfield
- Massage Therapy, Fairfield
- Material Handling Equipment, Fairfield - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Supplies & Equipment, Fairfield
- Membership Organizations, Fairfield
- Membership Sports & Recreation Clubs, Fairfield
- Mental Health Specialists, Fairfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Fairfield - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Fairfield - Iron Works
- Metaphysical Churches, Fairfield
- Methodist Church, Fairfield
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- Mexican Restaurants, Fairfield
- Middle Eastern Restaurants, Fairfield
- Mildew Removal & Control, Fairfield - Mold Removal
- Mining, Fairfield
- Miscellaneous Business Product Repair, Fairfield
- Miscellaneous Business Services, Fairfield
- Miscellaneous Government, Fairfield
- Miscellaneous Manufacturing, Fairfield
- Miscellaneous Personal Services, Fairfield
- Miscellaneous Photographers, Fairfield
- Miscellaneous Professional, Fairfield
- Mobile Homes for Rent & Lease, Fairfield
- Moldings Materials, Fairfield
- Molds, Fairfield
- Monuments, Tombstones, Markers & Memorials, Fairfield
- Mopeds, Scooter & Mini-Bikes Parts, Accessories & Dealers, Fairfield
- Mortgage Bankers & Correspondents, Fairfield
- Motion Picture Pre & Post Production Services, Fairfield
- Motor Vehicle, Fairfield
- Motor Vehicle Rental & Leasing, Fairfield
- Motorcycle Parts, Accessories & Dealers, Fairfield
- Movie Theaters, Fairfield
- Moving Companies, Fairfield
- Moving Supplies & Equipment Rental, Fairfield
- Moving Truck Rental , Fairfield
- Muffler Shop & Exhaust Systems, Fairfield
- Multimedia Publishers, Fairfield - Multimedia Services & Systems
- Music, Fairfield
- Music Publishers & Distribution, Fairfield
- Musical Instrument Rental, Fairfield - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Fairfield
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