- Machine Shop, Swampscott
- Machinery Repair & Rebuild, Swampscott
- Machinery, Supplies & Equipment - Business Production Related, Swampscott
- Machinery, Supplies & Equipment - Business Supplies Related, Swampscott
- Machinery, Supplies & Equipment - Construction & Contractor Related, Swampscott
- Mailbox Rental Services, Swampscott
- Mailing, Delivery & Courier Service, Swampscott
- Management Consultants & Services, Swampscott
- Manicurists & Pedicurists, Swampscott
- Manufacturing, Swampscott
- Manufacturing & Industrial Consultants, Swampscott
- Marriage & Family Counselors, Swampscott
- Martial Arts & Self Defense Schools, Swampscott
- Masonry Contractors, Swampscott - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Swampscott
- Massage Therapists & Professional, Swampscott
- Massage Therapy, Swampscott
- Massage Therapy Relaxation, Swampscott
- Meat Market, Wholesale & Products, Swampscott
- Medical Billing Services, Swampscott
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- Medical Supplies & Equipment, Swampscott
- Membership Sports & Recreation Clubs, Swampscott
- Men's Clothing Stores, Swampscott - Clothes & Accessories
- Mental Health Specialists, Swampscott - Psychologist, Psychiatrist, Psychotherapist, etc
- Metaphysical Churches, Swampscott
- Mexican Restaurants, Swampscott
- Mind-Body Massage, Swampscott
- Mini & Self Storage, Swampscott
- Miscellaneous Business Product Repair, Swampscott
- Miscellaneous Household Item Repair, Swampscott
- Miscellaneous Government, Swampscott
- Miscellaneous Personal Services, Swampscott
- Miscellaneous Professional, Swampscott
- Mortgage Bankers & Correspondents, Swampscott
- Mortgage Companies, Swampscott
- Motor Vehicle, Swampscott
- Moving & Storage Supplies & Equipment, Swampscott
- Muffler Shop & Exhaust Systems, Swampscott
- Museums, Swampscott
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