- Machine Shop & Tool Repair Service, Brownfield
- Machinery, Supplies & Equipment - Business Production Related, Brownfield
- Machinery, Supplies & Equipment - Business Supplies Related, Brownfield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Brownfield
- Mail Delivery Service, Brownfield
- Mailing, Delivery & Courier Service, Brownfield
- Management Consultants & Services, Brownfield
- Manicurists & Pedicurists, Brownfield
- Manufacturing, Brownfield
- Manufacturing Products, Brownfield
- Masonry Materials & Supplies, Brownfield
- Mechanical Contractors, Brownfield - Install, Service & Repair
- Medical Alert Systems, Brownfield - Medical Alarms - PERS
- Medical Diagnostic Clinics, Brownfield - Clinical Labs & Centers
- Medical Supplies & Equipment, Brownfield
- Membership Sports & Recreation Clubs, Brownfield
- Mental Health Clinics, Brownfield - Treatment Centers
- Mental Health Specialists, Brownfield - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Brownfield
- Merle Norman Cosmetics, Brownfield
- Metal Buildings, Brownfield - Wood Buildings
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- Metal Buildings, Brownfield - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Brownfield - Iron Works
- Methodist Church, Brownfield
- Mexican Food & Goods Products, Brownfield
- Mexican Restaurants, Brownfield
- Mini & Self Storage, Brownfield
- Mining, Brownfield
- Mining Contractors, Brownfield - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Brownfield - Mining Companies
- Miscellaneous Business Credit Institutions & Services, Brownfield
- Miscellaneous Business Product Repair, Brownfield
- Miscellaneous Agriculture, Brownfield
- Miscellaneous Government, Brownfield
- Miscellaneous Personal Services, Brownfield
- Miscellaneous Professional, Brownfield
- Monuments, Tombstones, Markers & Memorials, Brownfield
- Motor Vehicle, Brownfield
- Motor Vehicle Rental & Leasing, Brownfield
- Moving Truck Rental , Brownfield
- Muffler Shop & Exhaust Systems, Brownfield
- Museums, Brownfield
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