- Machinery, Supplies & Equipment - Construction & Contractor Related, Fairfield
- Management Consultants & Services, Fairfield
- Manufacturing, Fairfield
- Martial Arts & Self Defense Schools, Fairfield
- Masonry Materials & Supplies, Fairfield
- Medical & Dental Management, Fairfield
- Medical Management & Business Administration Service, Fairfield
- Medical Supplies & Equipment, Fairfield
- Membership Sports & Recreation Clubs, Fairfield
- Mennonite Church, Fairfield
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- Methodist Church, Fairfield
- Miscellaneous Business Product Repair, Fairfield
- Miscellaneous Government, Fairfield
- Miscellaneous Personal Services, Fairfield
- Miscellaneous Professional, Fairfield
- Motor Vehicle, Fairfield
- Motorcycle & Motor Scooters Dealers, Repair & Service, Fairfield
- Motorcycle Parts, Accessories & Dealers, Fairfield
- Motorcycle Repair & Service, Fairfield
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