- Machinery Repair & Rebuild, Spencerville
- Machinery, Supplies & Equipment - Business Production Related, Spencerville
- Mail Delivery Service, Spencerville
- Major Appliances, Spencerville - Household & Kitchen
- Management Consultants & Services, Spencerville
- Manufacturers Agents & Representatives, Spencerville
- Manufacturers Representative, Spencerville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Spencerville
- Manufacturing Products, Spencerville
- Massage Therapy, Spencerville
- Medical Research, Spencerville
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- Medical Research & Development, Spencerville - Medical Information & Research
- Medical Supplies & Equipment, Spencerville
- Metal Repair Service & Blacksmith, Spencerville - Iron Works
- Methodist Church, Spencerville
- Ministries Church, Spencerville
- Miscellaneous Industry, Spencerville
- Miscellaneous Manufacturing, Spencerville
- Miscellaneous Photographers, Spencerville
- Mortgages & Loans, Spencerville
- Motor Vehicle, Spencerville
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