- Machine Shop & Tool Repair Service, Helena
- Machinery, Supplies & Equipment - Business Production Related, Helena
- Machinery, Supplies & Equipment - Construction & Contractor Related, Helena
- Management Consultants & Services, Helena
- Manicurists & Pedicurists, Helena
- Manufacturing, Helena
- Manufacturing Products, Helena
- Masonry Materials & Supplies, Helena
- Mechanical Contractors, Helena - Install, Service & Repair
- Membership Sports & Recreation Clubs, Helena
- Metal Buildings, Helena - Kits, Homes, Steel Buildings, etc
- Metal Pigment & Paint Products, Helena
- Metal Roofs, Helena
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- Metal Working Machinery, Helena
- Methodist Church, Helena
- Mexican Restaurants, Helena
- Millwork Contractors, Helena
- Miscellaneous Government, Helena
- Miscellaneous Professional, Helena
- Mission Churches, Helena
- Mortgage Companies, Helena
- Motor Vehicle, Helena
- Motor Vehicle Rental & Leasing, Helena
- Moving Truck Rental , Helena
- Musical Instruments Repair, Sales & Service, Helena
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