- Machine Shop, Helena
- Machine Shop & Tool Repair Service, Helena
- Machinery Movers & Erectors, Helena
- Machinery, Supplies & Equipment - Business Production Related, Helena
- Machinery, Supplies & Equipment - Business Supplies Related, Helena
- Machinery, Supplies & Equipment - Construction & Contractor Related, Helena
- Magazine & Newspaper Stands, Helena - Dealers & Distributors
- Mailbox Rental Services, Helena
- Mailing, Delivery & Courier Service, Helena
- Maintenance, Cleaning & Sanitation, Helena
- Major Appliances, Helena - Household & Kitchen
- Malls & Shopping Centers, Helena
- Management Consultants & Services, Helena
- Manicurists & Pedicurists, Helena
- Manufacturing, Helena
- Manufacturing & Industrial Consultants, Helena
- Manufacturing Products, Helena
- Marinas & Marina Services, Helena
- Marine Supplies & Equipment, Helena - Boat Supplies
- Marriage & Family Counselors, Helena
- Martial Arts & Self Defense Schools, Helena
- Mary Kay Cosmetics, Helena
- Masonry Contractors, Helena - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Helena
- Massage Therapists & Professional, Helena
- Massage Therapy, Helena
- Maternity Clothes & Clothing Stores, Helena - Maternity Dress, Gown, Swimwear, Underwear & More
- Mats & Matting, Helena
- Meat Cutting Services, Helena
- Meat Market, Wholesale & Products, Helena
- Mechanical Engineer, Helena - Mechanical Engineering Service
- Medical & Dental Associations, Helena
- Medical & Dental Management, Helena
- Medical & Health Service Organizations, Helena
- Medical Equipment Manufacturers, Helena
- Medical Examiner, Helena - Doctors, Physicians & Surgeons
- Medical Management & Business Administration Service, Helena
- Medical Supplies & Equipment, Helena
- Mediterranean Restaurants, Helena
- Membership Sports & Recreation Clubs, Helena
- Men's & Boys Clothing & Accessories Stores, Helena
- Men's Clothing Stores, Helena - Clothes & Accessories
- Mens & Boys Belts & Suspenders, Helena
- Mental Health Specialists, Helena - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Helena
- Metal Buildings, Helena - Kits, Homes, Steel Buildings, etc
- Metal Coating & Allied Services, Helena
- Metal Finishers, Helena
- Metal Plating & Polishing, Helena
- Metal Repair Service & Blacksmith, Helena - Iron Works
- Metaphysical Churches, Helena
- Meters Repair, Helena
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- Methodist Church, Helena
- Mexican Restaurants, Helena
- Midwives, Helena
- Mildew Removal & Control, Helena - Mold Removal
- Millwork Contractors, Helena
- Minerals, Helena
- Mini & Self Storage, Helena
- Mini Golf Courses, Helena
- Mining, Helena
- Mining Contractors, Helena - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Helena - Mining Companies
- Mirrors, Helena - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Helena
- Miscellaneous Household Item Repair, Helena
- Miscellaneous Agriculture, Helena
- Miscellaneous Business Services, Helena
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Helena
- Miscellaneous Government, Helena
- Miscellaneous Industry, Helena
- Miscellaneous Manufacturing, Helena
- Miscellaneous Personal Services, Helena
- Miscellaneous Photographers, Helena
- Miscellaneous Professional, Helena
- Mobile Home Contractors, Helena
- Mobile Home Improvements & Repairs, Helena
- Mobile Home Parks & Communities , Helena
- Modular & Mobile Homes For Sale, Helena - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Helena
- Mortgage Bankers & Correspondents, Helena
- Mortgage Contracts & Services, Helena
- Mortgages & Loans, Helena
- Motion Picture Pre & Post Production Services, Helena
- Motion Pictures Video Tape Duplication & Transfer Services, Helena
- Motor Vehicle, Helena
- Motor Vehicle Rental & Leasing, Helena
- Motorcycle & ATV Repair & Service, Helena
- Motorcycle Parts, Accessories & Dealers, Helena
- Motorcycle Repair & Service, Helena
- Movie Theaters, Helena
- Moving & Storage Supplies & Equipment, Helena
- Moving Companies, Helena
- Moving Supplies & Equipment Rental, Helena
- Moving Truck Rental , Helena
- Muffler Shop & Exhaust Systems, Helena
- Museums, Helena
- Music, Helena
- Music Entertainment, Helena
- Music Schools, Helena
- Musical Instruments & Equipment Stores, Helena
- Musical Instruments - Violins, Helena
- Musical Instruments Repair, Sales & Service, Helena
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