- Machine Shop & Tool Repair Service, Westminster
- Machinery And Equipment Manufacturers, Westminster
- Machinery Custom Design Manufacturers, Westminster
- Machinery, Supplies & Equipment - Business Production Related, Westminster
- Maintenance, Cleaning & Sanitation, Westminster
- Manufacturing, Westminster
- Manufacturing Products, Westminster
- Masonry Materials & Supplies, Westminster
- Mennonite Church, Westminster
- Metal Repair Service & Blacksmith, Westminster - Iron Works
- Methodist Church, Westminster
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- Mexican Restaurants, Westminster
- Mildew Removal & Control, Westminster - Mold Removal
- Miscellaneous Government, Westminster
- Miscellaneous Personal Services, Westminster
- Mortgage Bankers & Correspondents, Westminster
- Motor Vehicle, Westminster
- Motor Vehicle Rental & Leasing, Westminster
- Moving Truck Rental , Westminster
- Mulch, Peat & Moss Products, Westminster
- Museums, Westminster
- Musical Instruments Repair, Sales & Service, Westminster
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