- Machinery, Supplies & Equipment - Business Supplies Related, West Allis
- Machinery, Supplies & Equipment - Construction & Contractor Related, West Allis
- Mailbox Rental Services, West Allis
- Mailing, Delivery & Courier Service, West Allis
- Management Consultants & Services, West Allis
- Martial Arts & Self Defense Schools, West Allis
- Masonry Materials & Supplies, West Allis
- Mini & Self Storage, West Allis
- Miscellaneous Agriculture, West Allis
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