- Machine Shop & Tool Repair Service, Saint Louis
- Machinery And Equipment Manufacturers, Saint Louis
- Machinery, Supplies & Equipment - Business Production Related, Saint Louis
- Machinery, Supplies & Equipment - Business Supplies Related, Saint Louis
- Machinery, Supplies & Equipment - Construction & Contractor Related, Saint Louis
- Manufacturing, Saint Louis
- Marine Products And Services, Saint Louis
- Marine Repair & Service Stations, Saint Louis
- Marine Supplies & Equipment, Saint Louis - Boat Supplies
- Marine Supplies & Equipment Repair, Saint Louis - Boat Supplies & Equipment
- Marriage & Family Counselors, Saint Louis
- Massage Therapists & Professional, Saint Louis
- Massage Therapy, Saint Louis
- Men's & Boys Clothing & Accessories Stores, Saint Louis
- Mens & Boys Jeans & Western Wear Stores, Saint Louis
- Merchandise Sales Events, Saint Louis
- Methodist Church, Saint Louis
- Mexican Restaurants, Saint Louis
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- Mini & Self Storage, Saint Louis
- Miscellaneous Household Item Repair, Saint Louis
- Miscellaneous Agriculture, Saint Louis
- Miscellaneous Government, Saint Louis
- Miscellaneous Manufacturing, Saint Louis
- Miscellaneous Personal Services, Saint Louis
- Miscellaneous Professional, Saint Louis
- Mobile Home Parks & Communities , Saint Louis
- Monuments, Tombstones, Markers & Memorials, Saint Louis
- Motor Vehicle, Saint Louis
- Motor Vehicle Rental & Leasing, Saint Louis
- Moving Supplies & Equipment Rental, Saint Louis
- Moving Truck Rental , Saint Louis
- Muffler Shop & Exhaust Systems, Saint Louis
- Music, Saint Louis
- Musical Instrument Rental, Saint Louis - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Saint Louis
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