- Machine Shop, Fairfield
- Machine Shop & Tool Repair Service, Fairfield
- Machinery And Equipment Manufacturers, Fairfield
- Machinery, Supplies & Equipment - Business Supplies Related, Fairfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fairfield
- Major Appliances, Fairfield - Household & Kitchen
- Management Consultants & Services, Fairfield
- Manicurists & Pedicurists, Fairfield
- Manufacturing, Fairfield
- Marriage & Family Counselors, Fairfield
- Masonry Materials & Supplies, Fairfield
- Medical Equipment Manufacturers, Fairfield
- Medical Groups & Clinics, Fairfield - Medical & Health Centers
- Medical Supplies & Equipment, Fairfield
- Men's & Boys Clothing & Accessories Stores, Fairfield
- Men's Clothing Stores, Fairfield - Clothes & Accessories
- Men's Shoe Stores, Fairfield
- Mens & Boys Jeans & Western Wear Stores, Fairfield
- Mental Health Specialists, Fairfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Fairfield
- Merchandise Sales Events, Fairfield
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- Metal Buildings, Fairfield - Wood Buildings
- Metal Buildings, Fairfield - Kits, Homes, Steel Buildings, etc
- Methodist Church, Fairfield
- Mexican Restaurants, Fairfield
- Mini & Self Storage, Fairfield
- Mining, Fairfield
- Miscellaneous Business Services, Fairfield
- Miscellaneous Government, Fairfield
- Miscellaneous Industry, Fairfield
- Miscellaneous Photographers, Fairfield
- Modular & Mobile Homes For Sale, Fairfield - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Fairfield
- Motor Vehicle, Fairfield
- Motor Vehicle Rental & Leasing, Fairfield
- Motorcycle & ATV Repair & Service, Fairfield
- Motorcycle & Motor Scooters Dealers, Repair & Service, Fairfield
- Motorcycle Repair & Service, Fairfield
- Movie Theaters, Fairfield
- Moving Truck Rental , Fairfield
- Music, Fairfield
- Musical Instruments & Equipment Stores, Fairfield
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