- Machine Shop & Tool Repair Service, Monroe City
- Machinery And Equipment Manufacturers, Monroe City
- Machinery, Supplies & Equipment - Business Supplies Related, Monroe City
- Machinery, Supplies & Equipment - Construction & Contractor Related, Monroe City
- Mailing, Delivery & Courier Service, Monroe City
- Malls & Shopping Centers, Monroe City
- Management Consultants & Services, Monroe City
- Manufacturing, Monroe City
- Marinas & Marina Services, Monroe City
- Meat Market, Wholesale & Products, Monroe City
- Meat Packers, Monroe City
- Mental Health Clinics, Monroe City - Treatment Centers
- Metal Repair Service & Blacksmith, Monroe City - Iron Works
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- Methodist Church, Monroe City
- Mexican Restaurants, Monroe City
- Mining, Monroe City
- Miscellaneous Government, Monroe City
- Mobile Home Parks & Communities , Monroe City
- Monuments, Tombstones, Markers & Memorials, Monroe City
- Mortgage Bankers & Correspondents, Monroe City
- Motor Vehicle, Monroe City
- Motor Vehicle Rental & Leasing, Monroe City
- Movie Theaters, Monroe City
- Moving Supplies & Equipment Rental, Monroe City
- Moving Truck Rental , Monroe City
- Muffler Shop & Exhaust Systems, Monroe City
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