- Machine Shop & Tool Repair Service, Union City
- Machinery, Supplies & Equipment - Business Production Related, Union City
- Machinery, Supplies & Equipment - Business Supplies Related, Union City
- Manufacturing, Union City
- Manufacturing Products, Union City
- Masonry Contractors, Union City - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Union City
- Mausoleums Developers, Union City
- Merchandise Sales Events, Union City
- Messenger Service, Union City - Message Receiving & Forwarding Service
- Metal Cleaning & Pickling, Union City
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- Metal Plating & Polishing, Union City
- Methodist Church, Union City
- Mini & Self Storage, Union City
- Miscellaneous Government, Union City
- Miscellaneous Industry, Union City
- Miscellaneous Personal Services, Union City
- Monuments, Tombstones, Markers & Memorials, Union City
- Motor Vehicle, Union City
- Motor Vehicle Rental & Leasing, Union City
- Moving Truck Rental , Union City
- Museums, Union City
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