- Machinery Movers & Erectors, Fairfield
- Machinery, Supplies & Equipment - Business Production Related, Fairfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fairfield
- Mailing, Delivery & Courier Service, Fairfield
- Major Appliances, Fairfield - Household & Kitchen
- Manicurists & Pedicurists, Fairfield
- Manufacturing, Fairfield
- Masonry Materials & Supplies, Fairfield
- Massage Therapists & Professional, Fairfield
- Massage Therapy, Fairfield
- Medical Supplies & Equipment, Fairfield
- Membership Sports & Recreation Clubs, Fairfield
- Mental Retardation & Developmentally Disabled Services, Fairfield
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- Merchandise Sales Events, Fairfield
- Metal Buildings, Fairfield - Kits, Homes, Steel Buildings, etc
- Methodist Church, Fairfield
- Miscellaneous Government, Fairfield
- Miscellaneous Personal Services, Fairfield
- Modular & Mobile Homes For Sale, Fairfield - Manufactured Homes Sale & Service
- Motor Vehicle, Fairfield
- Motor Vehicle Rental & Leasing, Fairfield
- Moving Companies, Fairfield
- Museums, Fairfield
- Music, Fairfield
- Musical Instruments & Equipment Stores, Fairfield
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