- Machine Shop & Tool Repair Service, Elwood
- Machinery, Supplies & Equipment - Business Supplies Related, Elwood
- Macrame & Macrame Supplies, Elwood
- Management Consultants & Services, Elwood
- Manicurists & Pedicurists, Elwood
- Manufacturing, Elwood
- Manufacturing Products, Elwood
- Martial Arts & Self Defense Schools, Elwood
- Masonry Materials & Supplies, Elwood
- Massage Therapy, Elwood
- Medical Research, Elwood
- Medical Research & Development, Elwood - Medical Information & Research
- Messenger Service, Elwood - Message Receiving & Forwarding Service
- Metal Cleaning & Pickling, Elwood
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- Metal Finishers, Elwood
- Metal Plating & Polishing, Elwood
- Methodist Church, Elwood
- Mexican Restaurants, Elwood
- Mini & Self Storage, Elwood
- Miscellaneous Government, Elwood
- Miscellaneous Professional, Elwood
- Mobile Home Parks & Communities , Elwood
- Monuments, Tombstones, Markers & Memorials, Elwood
- Motor Vehicle, Elwood
- Motor Vehicle Rental & Leasing, Elwood
- Moving Supplies & Equipment Rental, Elwood
- Moving Truck Rental , Elwood
- Muffler Shop & Exhaust Systems, Elwood
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