- Machine Shop & Tool Repair Service, Big Timber
- Machinery, Supplies & Equipment - Construction & Contractor Related, Big Timber
- Major Appliances, Big Timber - Household & Kitchen
- Manufacturing, Big Timber
- Manufacturing Products, Big Timber
- Market Research & Analysis , Big Timber - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Big Timber
- Masonry Contractors, Big Timber - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Big Timber
- Massage Therapists & Professional, Big Timber
- Massage Therapy, Big Timber
- Meat Market, Wholesale & Products, Big Timber
- Membership Sports & Recreation Clubs, Big Timber
- Mental Health Specialists, Big Timber - Psychologist, Psychiatrist, Psychotherapist, etc
- Mini & Self Storage, Big Timber
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- Mining Equipment & Supplies, Big Timber
- Miscellaneous Business Services, Big Timber
- Miscellaneous Industry, Big Timber
- Miscellaneous Manufacturing, Big Timber
- Miscellaneous Professional, Big Timber
- Motor Vehicle, Big Timber
- Motor Vehicle Rental & Leasing, Big Timber
- Motorcycle & Motor Scooters Dealers, Repair & Service, Big Timber
- Motorcycle Repair & Service, Big Timber
- Movie Theaters, Big Timber
- Moving Supplies & Equipment Rental, Big Timber
- Moving Truck Rental , Big Timber
- Museums, Big Timber
- Music, Big Timber
- Musical Instruments & Equipment Stores, Big Timber
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