- Machine Tools , Sudbury
- Machinery, Supplies & Equipment - Business Production Related, Sudbury
- Machinery, Supplies & Equipment - Business Supplies Related, Sudbury
- Mailbox Rental Services, Sudbury
- Mailing, Delivery & Courier Service, Sudbury
- Major Appliances, Sudbury - Household & Kitchen
- Management Consultants & Services, Sudbury
- Manicurists & Pedicurists, Sudbury
- Manufacturers Agents & Representatives, Sudbury
- Manufacturers Representative, Sudbury - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Sudbury
- Market Research & Analysis , Sudbury - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Sudbury
- Martial Arts & Self Defense Schools, Sudbury
- Masonry Contractors, Sudbury - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sudbury
- Massage Therapists & Professional, Sudbury
- Massage Therapy, Sudbury
- Medical & Dental Management, Sudbury
- Medical Diagnostic Clinics, Sudbury - Clinical Labs & Centers
- Medical Supplies & Equipment, Sudbury
- Membership Sports & Recreation Clubs, Sudbury
- Mental Health Clinics, Sudbury - Treatment Centers
- Mental Health Specialists, Sudbury - Psychologist, Psychiatrist, Psychotherapist, etc
- Metaphysical Churches, Sudbury
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- Methodist Church, Sudbury
- Microfilm & Imaging Service, Equipment & Supplies , Sudbury
- Middle Eastern Restaurants, Sudbury
- Miscellaneous Household Item Repair, Sudbury
- Miscellaneous Business Services, Sudbury
- Miscellaneous Manufacturing, Sudbury
- Miscellaneous Personal Services, Sudbury
- Miscellaneous Professional, Sudbury
- Mortgage Bankers & Correspondents, Sudbury
- Motion Picture & Television Production Services, Sudbury
- Motion Picture Dists & Producers, Sudbury
- Motor Vehicle, Sudbury
- Moving & Storage Supplies & Equipment, Sudbury
- Moving Companies, Sudbury
- Moving Services - Labor & Material, Sudbury
- Multimedia Publishers, Sudbury - Multimedia Services & Systems
- Museums, Sudbury
- Music, Sudbury
- Music Entertainment, Sudbury
- Music Lessons, Sudbury
- Music Lessons - Instrumental, Sudbury
- Musical Instrument Rental, Sudbury - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Sudbury
- Musicians, Bands & Disc Jockeys, Sudbury
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