- Machine Shop, Fairfield
- Machine Shop & Tool Repair Service, Fairfield
- Machinery, Supplies & Equipment - Business Supplies Related, Fairfield
- Malls & Shopping Centers, Fairfield
- Management Consultants & Services, Fairfield
- Manicurists & Pedicurists, Fairfield
- Manufacturing, Fairfield
- Manufacturing Products, Fairfield
- Masonry Materials & Supplies, Fairfield
- Membership Sports & Recreation Clubs, Fairfield
- Men's Clothing Stores, Fairfield - Clothes & Accessories
- Metal Plating & Polishing, Fairfield
- Metal Products, Fairfield
- Metal Services, Fairfield
- Methodist Church, Fairfield
- Mining, Fairfield
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- Ministries Church, Fairfield
- Miscellaneous Fabricated Wire Products Manufacturers, Fairfield
- Miscellaneous Business Services, Fairfield
- Miscellaneous Government, Fairfield
- Miscellaneous Industry, Fairfield
- Miscellaneous Manufacturing, Fairfield
- Miscellaneous Professional, Fairfield
- Money Transfer Service, Fairfield
- Monuments, Tombstones, Markers & Memorials, Fairfield
- Mortgages & Loans, Fairfield
- Motor Vehicle, Fairfield
- Motor Vehicle Rental & Leasing, Fairfield
- Movie Theaters, Fairfield
- Moving Companies, Fairfield
- Moving Supplies & Equipment Rental, Fairfield
- Moving Truck Rental , Fairfield
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