- Machinery, Supplies & Equipment - Business Supplies Related, Somerville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Somerville
- Manufacturing, Somerville
- Meat Market, Wholesale & Products, Somerville
- Mechanical Contractors, Somerville - Install, Service & Repair
- Membership Sports & Recreation Clubs, Somerville
- Metal Buildings, Somerville - Kits, Homes, Steel Buildings, etc
- Methodist Church, Somerville
- Mexican Restaurants, Somerville
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- Mining, Somerville
- Miscellaneous Government, Somerville
- Monuments, Tombstones, Markers & Memorials, Somerville
- Mortgage Companies, Somerville
- Motor Vehicle, Somerville
- Motor Vehicle Rental & Leasing, Somerville
- Moving Companies, Somerville
- Moving Truck Rental , Somerville
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