- Machine Shop & Tool Repair Service, Grundy Center
- Machinery, Supplies & Equipment - Business Supplies Related, Grundy Center
- Machinery, Supplies & Equipment - Construction & Contractor Related, Grundy Center
- Mail Delivery Service, Grundy Center
- Major Appliances, Grundy Center - Household & Kitchen
- Manufacturing, Grundy Center
- Masonry Materials & Supplies, Grundy Center
- Massage Therapists & Professional, Grundy Center
- Massage Therapy, Grundy Center
- Maytag Appliances, Grundy Center
- Meat Market, Wholesale & Products, Grundy Center
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- Membership Sports & Recreation Clubs, Grundy Center
- Metal Lockers, Grundy Center
- Methodist Church, Grundy Center
- Miscellaneous Government, Grundy Center
- Miscellaneous Manufacturing, Grundy Center
- Miscellaneous Photographers, Grundy Center
- Miscellaneous Professional, Grundy Center
- Monuments, Tombstones, Markers & Memorials, Grundy Center
- Motor Vehicle, Grundy Center
- Movie Theaters, Grundy Center
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