- Machine Shop & Tool Repair Service, Marathon
- Machinery, Supplies & Equipment - Business Production Related, Marathon
- Machinery, Supplies & Equipment - Business Supplies Related, Marathon
- Machinery, Supplies & Equipment - Construction & Contractor Related, Marathon
- Mail Delivery Service, Marathon
- Mailbox Rental Services, Marathon
- Mailing, Delivery & Courier Service, Marathon
- Maintenance, Cleaning & Sanitation, Marathon
- Major Appliances, Marathon - Household & Kitchen
- Management Consultants & Services, Marathon
- Manicurists & Pedicurists, Marathon
- Manufacturing, Marathon
- Manufacturing Products, Marathon
- Marinas & Marina Services, Marathon
- Marine Contractors & Designers, Marathon
- Marine Electronic Equipment, Marathon
- Marine Products And Services, Marathon
- Marine Repair & Service Stations, Marathon
- Marine Salvage & Wrecking Services, Marathon
- Marine Services, Marathon
- Marine Supplies & Equipment, Marathon - Boat Supplies
- Marine Supplies & Equipment - Boat Engine & Drive Train Repair, Marathon
- Marine Supplies & Equipment Repair, Marathon - Boat Supplies & Equipment
- Marine Surveyors & Adjustors, Marathon
- Marriage & Family Counselors, Marathon
- Masonry Materials & Supplies, Marathon
- Material Handling & Heavy Machinery & Equipment, Marathon
- Mattress & Bedspring Manufacturers, Marathon
- Meat Market, Wholesale & Products, Marathon
- Medical & Health Service Organizations, Marathon
- Medical Diagnostic Clinics, Marathon - Clinical Labs & Centers
- Medical Supplies & Equipment, Marathon
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- Membership Sports & Recreation Clubs, Marathon
- Mental Health Clinics, Marathon - Treatment Centers
- Mental Health Specialists, Marathon - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Finishers, Marathon
- Metal Plating & Polishing, Marathon
- Methodist Church, Marathon
- Mexican Restaurants, Marathon
- Mildew Removal & Control, Marathon - Mold Removal
- Mirrors, Marathon - Custom, Framed, Bathroom, Vanity & Wall Mirrors
- Miscellaneous Household Item Repair, Marathon
- Miscellaneous Government, Marathon
- Miscellaneous Personal Services, Marathon
- Miscellaneous Professional, Marathon
- Mobile Home Parks & Communities , Marathon
- Modular & Mobile Homes For Sale, Marathon - Manufactured Homes Sale & Service
- Mopeds & Motor Scooters Rental, Marathon
- Mortgage Bankers & Correspondents, Marathon
- Mortgages & Loans, Marathon
- Motor Vehicle, Marathon
- Motor Vehicle Rental & Leasing, Marathon
- Movie Theaters, Marathon
- Moving & Storage Supplies & Equipment, Marathon
- Moving Supplies & Equipment Rental, Marathon
- Moving Truck Rental , Marathon
- Muffler Shop & Exhaust Systems, Marathon
- Museums, Marathon
- Music, Marathon
- Music Lessons, Marathon
- Music Lessons - Instrumental, Marathon
- Musical Instrument Rental, Marathon - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Marathon
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