- Machinery, Supplies & Equipment - Business Production Related, Sonoita
- Mailing, Delivery & Courier Service, Sonoita
- Management Consultants & Services, Sonoita
- Manufacturing, Sonoita
- Medical & Dental Management, Sonoita
- Medical Management & Business Administration Service, Sonoita
- Membership Sports & Recreation Clubs, Sonoita
- Mental Health Specialists, Sonoita - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Sonoita
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- Mining, Sonoita
- Mining Contractors, Sonoita - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Sonoita - Mining Companies
- Miscellaneous Business Services, Sonoita
- Miscellaneous Government, Sonoita
- Miscellaneous Personal Services, Sonoita
- Motor Vehicle, Sonoita
- Motor Vehicle Rental & Leasing, Sonoita
- Moving Truck Rental , Sonoita
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