- Machine Shop & Tool Repair Service, Marathon
- Machinery And Equipment Manufacturers, Marathon
- Machinery, Supplies & Equipment - Construction & Contractor Related, Marathon
- Mail Delivery Service, Marathon
- Mailing, Delivery & Courier Service, Marathon
- Manufacturing, Marathon
- Masonry Contractors, Marathon - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Marathon
- Meat Market, Wholesale & Products, Marathon
- Medical Groups & Clinics, Marathon - Medical & Health Centers
- Membership Sports & Recreation Clubs, Marathon
- Merchandise Sales Events, Marathon
- Metal Buildings, Marathon - Kits, Homes, Steel Buildings, etc
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- Metal Doors Sash & Trim Manufacturers, Marathon
- Mining, Marathon
- Miscellaneous Agriculture, Marathon
- Miscellaneous Government, Marathon
- Miscellaneous Industry, Marathon
- Miscellaneous Personal Services, Marathon
- Miscellaneous Professional, Marathon
- Mobile Home Parks & Communities , Marathon
- Mortgage Bankers & Correspondents, Marathon
- Motor Vehicle, Marathon
- Motor Vehicle Rental & Leasing, Marathon
- Moving Truck Rental , Marathon
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