- Machine Shop & Tool Repair Service, Blackwell
- Machinery, Supplies & Equipment - Business Supplies Related, Blackwell
- Machinery, Supplies & Equipment - Construction & Contractor Related, Blackwell
- Manufacturing, Blackwell
- Manufacturing Products, Blackwell
- Masonry Contractors, Blackwell - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Blackwell
- Meat Market, Wholesale & Products, Blackwell
- Mechanical Engineer, Blackwell - Mechanical Engineering Service
- Medical Diagnostic Clinics, Blackwell - Clinical Labs & Centers
- Merchandise Sales Events, Blackwell
- Methodist Church, Blackwell
- Mexican Restaurants, Blackwell
- Miscellaneous Household Item Repair, Blackwell
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- Miscellaneous Agriculture, Blackwell
- Miscellaneous Government, Blackwell
- Miscellaneous Manufacturing, Blackwell
- Miscellaneous Personal Services, Blackwell
- Miscellaneous Professional, Blackwell
- Monuments, Tombstones, Markers & Memorials, Blackwell
- Mortgage Bankers & Correspondents, Blackwell
- Motor Vehicle, Blackwell
- Motor Vehicle Rental & Leasing, Blackwell
- Moving Supplies & Equipment Rental, Blackwell
- Moving Truck Rental , Blackwell
- Muffler Shop & Exhaust Systems, Blackwell
- Museums, Blackwell
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