- Machine Shop & Tool Repair Service, Grantsville
- Machinery, Supplies & Equipment - Business Supplies Related, Grantsville
- Magazine & Newspaper Stands, Grantsville - Dealers & Distributors
- Maintenance, Cleaning & Sanitation, Grantsville
- Management Consultants & Services, Grantsville
- Manufacturing, Grantsville
- Masonry Materials & Supplies, Grantsville
- Massage Therapy, Grantsville
- Meat Brokers, Grantsville
- Meat Market, Wholesale & Products, Grantsville
- Mennonite Church, Grantsville
- Mental Health Specialists, Grantsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Grantsville
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- Methodist Church, Grantsville
- Mildew Removal & Control, Grantsville - Mold Removal
- Miscellaneous Government, Grantsville
- Miscellaneous Manufacturing, Grantsville
- Miscellaneous Personal Services, Grantsville
- Miscellaneous Professional, Grantsville
- Modular & Mobile Homes For Sale, Grantsville - Manufactured Homes Sale & Service
- Mortgages & Loans, Grantsville
- Motor Vehicle, Grantsville
- Museums, Grantsville
- Music, Grantsville
- Musical Instruments & Equipment Stores, Grantsville
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