- Machinery, Supplies & Equipment - Business Production Related, Somerville
- Machinery, Supplies & Equipment - Business Supplies Related, Somerville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Somerville
- Major Appliances, Somerville - Household & Kitchen
- Management Consultants & Services, Somerville
- Manicurists & Pedicurists, Somerville
- Manufacturing, Somerville
- Masonry Materials & Supplies, Somerville
- Meat Market, Wholesale & Products, Somerville
- Men's & Boys Clothing & Accessories Stores, Somerville
- Mens & Boys Jeans & Western Wear Stores, Somerville
- Mental Health Clinics, Somerville - Treatment Centers
- Merchandise Sales Events, Somerville
- Methodist Church, Somerville
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- Mexican Restaurants, Somerville
- Mini & Self Storage, Somerville
- Miscellaneous Business Credit Institutions & Services, Somerville
- Miscellaneous Business Services, Somerville
- Miscellaneous Government, Somerville
- Miscellaneous Professional, Somerville
- Modular & Mobile Homes For Sale, Somerville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Somerville
- Mortgage Bankers & Correspondents, Somerville
- Motor Vehicle, Somerville
- Motor Vehicle Rental & Leasing, Somerville
- Motorcycle Detailing, Somerville
- Motorcycle Parts, Accessories & Dealers, Somerville
- Moving Truck Rental , Somerville
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