- Machine Shop & Tool Repair Service, Spotswood
- Machinery, Supplies & Equipment - Business Supplies Related, Spotswood
- Machinery, Supplies & Equipment - Construction & Contractor Related, Spotswood
- Mailbox Rental Services, Spotswood
- Mailing, Delivery & Courier Service, Spotswood
- Management Consultants & Services, Spotswood
- Manicurists & Pedicurists, Spotswood
- Manufacturing, Spotswood
- Martial Arts & Self Defense Schools, Spotswood
- Masonry Contractors, Spotswood - Stone Mason, Brick Mason - Install & Repair
- Mathematicians, Spotswood
- Mechanical Contractors, Spotswood - Install, Service & Repair
- Medical Diagnostic Clinics, Spotswood - Clinical Labs & Centers
- Medical Research, Spotswood
- Medical Research & Development, Spotswood - Medical Information & Research
- Medical Supplies & Equipment, Spotswood
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- Methodist Church, Spotswood
- Mexican Food & Goods Products, Spotswood
- Miscellaneous Agriculture, Spotswood
- Miscellaneous Business Services, Spotswood
- Miscellaneous Government, Spotswood
- Miscellaneous Personal Services, Spotswood
- Miscellaneous Professional, Spotswood
- Monuments, Tombstones, Markers & Memorials, Spotswood
- Mortgage Bankers & Correspondents, Spotswood
- Mortgages & Loans, Spotswood
- Motor Vehicle, Spotswood
- Moving & Storage Supplies & Equipment, Spotswood
- Music, Spotswood
- Music Lessons, Spotswood
- Music Lessons - Instrumental, Spotswood
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