- Machine Shop, Sonora
- Machine Shop & Tool Repair Service, Sonora
- Machinery And Equipment Manufacturers, Sonora
- Machinery, Supplies & Equipment - Business Production Related, Sonora
- Machinery, Supplies & Equipment - Business Supplies Related, Sonora
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sonora
- Mail Delivery Service, Sonora
- Mailbox Rental Services, Sonora
- Mailing, Delivery & Courier Service, Sonora
- Maintenance, Cleaning & Sanitation, Sonora
- Major Appliance Repair & Service, Sonora
- Major Appliances, Sonora - Household & Kitchen
- Malls & Shopping Centers, Sonora
- Management Consultants & Services, Sonora
- Mandarin Restaurants, Sonora
- Manicurists & Pedicurists, Sonora
- Manufacturers Agents & Representatives, Sonora
- Manufacturers Representative, Sonora - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Sonora
- Manufacturing Products, Sonora
- Marble, Sonora
- Marine Supplies & Equipment, Sonora - Boat Supplies
- Markets & Grocers Equipment, Sonora
- Marriage & Family Counselors, Sonora
- Martial Arts & Self Defense Schools, Sonora
- Masonry Materials & Supplies, Sonora
- Massage Parlor & Steam Bath Services, Sonora
- Massage Therapists & Professional, Sonora
- Massage Therapy, Sonora
- Material Handling & Heavy Machinery & Equipment, Sonora
- Mattress & Bedspring Manufacturers, Sonora
- Mechanical Engineer, Sonora - Mechanical Engineering Service
- Medical & Dental Management, Sonora
- Medical Alert Systems, Sonora - Medical Alarms - PERS
- Medical Business Management Services, Sonora
- Medical Diagnostic Clinics, Sonora - Clinical Labs & Centers
- Medical Diagnostic Imaging, Sonora
- Medical Equipment Manufacturers, Sonora
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Sonora
- Medical Groups & Clinics, Sonora - Medical & Health Centers
- Medical Management & Business Administration Service, Sonora
- Medical Supplies & Equipment, Sonora
- Mental Health Specialists, Sonora - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Marketing Consultants, Sonora
- Metal Buildings, Sonora - Kits, Homes, Steel Buildings, etc
- Metal Plating & Polishing, Sonora
- Metaphysical Churches, Sonora
- Mexican Food, Sonora
- Mexican Restaurants, Sonora
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- Michelin Tires, Sonora - Dealers
- Microwave Oven Repair & Service, Sonora
- Microwave Ovens, Sonora
- Mildew Removal & Control, Sonora - Mold Removal
- Mini & Self Storage, Sonora
- Mining, Sonora
- Mirrors, Sonora - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Business Product Repair, Sonora
- Miscellaneous Household Item Repair, Sonora
- Miscellaneous Agriculture, Sonora
- Miscellaneous Business Services, Sonora
- Miscellaneous Government, Sonora
- Miscellaneous Industry, Sonora
- Miscellaneous Manufacturing, Sonora
- Miscellaneous Personal Services, Sonora
- Miscellaneous Photographers, Sonora
- Miscellaneous Professional, Sonora
- Mobile Home Parks & Communities , Sonora
- Modular & Mobile Homes For Sale, Sonora - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Sonora
- Mortgage Bankers & Correspondents, Sonora
- Mortgage Companies, Sonora
- Mortgages & Loans, Sonora
- Mosquito Control, Sonora
- Moth Proofing Services, Sonora
- Motor Vehicle, Sonora
- Motor Vehicle Rental & Leasing, Sonora
- Motorcycle & Motor Scooters Dealers, Repair & Service, Sonora
- Motorcycle Parts, Accessories & Dealers, Sonora
- Motorcycle Repair & Service, Sonora
- Movie Theaters, Sonora
- Moving & Storage Supplies & Equipment, Sonora
- Moving Companies, Sonora
- Moving Supplies & Equipment Rental, Sonora
- Moving Truck Rental , Sonora
- Mowers & Tractors, Sonora
- Muffler & Exhaust Systems Wholesale, Sonora
- Muffler Shop & Exhaust Systems, Sonora
- Mufflers & Exhaust Systems Manufacturers, Sonora
- Murals & Faux Finish Walls, Sonora
- Music, Sonora
- Music Lessons, Sonora
- Music Lessons - Instrumental, Sonora
- Music Lessons - Vocal, Sonora
- Music Sheet, Sonora
- Music Stores Retail, Sonora
- Musical Instrument Rental, Sonora - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Sonora
- Musical Instruments Repair, Sales & Service, Sonora
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