- Machine Shop, Gladwin
- Machine Shop & Tool Repair Service, Gladwin
- Machinery, Supplies & Equipment - Business Production Related, Gladwin
- Machinery, Supplies & Equipment - Business Supplies Related, Gladwin
- Machinery, Supplies & Equipment - Construction & Contractor Related, Gladwin
- Management Consultants & Services, Gladwin
- Manufacturing, Gladwin
- Manufacturing Products, Gladwin
- Marinas & Marina Services, Gladwin
- Marriage & Family Counselors, Gladwin
- Masonry Materials & Supplies, Gladwin
- Massage Therapy, Gladwin
- Meat Market, Wholesale & Products, Gladwin
- Medical Equipment Manufacturers, Gladwin
- Medical Supplies & Equipment, Gladwin
- Membership Sports & Recreation Clubs, Gladwin
- Merchandise Sales Events, Gladwin
- Metal Plating & Polishing, Gladwin
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- Methodist Church, Gladwin
- Mexican Restaurants, Gladwin
- Mining, Gladwin
- Ministries Church, Gladwin
- Miscellaneous Household Item Repair, Gladwin
- Miscellaneous Government, Gladwin
- Miscellaneous Personal Services, Gladwin
- Miscellaneous Photographers, Gladwin
- Miscellaneous Professional, Gladwin
- Mobile Home Parks & Communities , Gladwin
- Modular & Mobile Homes For Sale, Gladwin - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Gladwin
- Motor Vehicle, Gladwin
- Motor Vehicle Rental & Leasing, Gladwin
- Moving Supplies & Equipment Rental, Gladwin
- Moving Truck Rental , Gladwin
- Museums, Gladwin
- Musical Instrument Rental, Gladwin - Band & Orchestra Instruments
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