- Machinery, Supplies & Equipment - Business Supplies Related, Boonsboro
- Mail Delivery Service, Boonsboro
- Mailing, Delivery & Courier Service, Boonsboro
- Maintenance, Cleaning & Sanitation, Boonsboro
- Management Consultants & Services, Boonsboro
- Manufacturing, Boonsboro
- Manufacturing Products, Boonsboro
- Marine Supplies & Equipment, Boonsboro - Boat Supplies
- Medical & Dental Management, Boonsboro
- Medical Diagnostic Clinics, Boonsboro - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, Boonsboro
- Merchandise Sales Events, Boonsboro
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- Methodist Church, Boonsboro
- Mildew Removal & Control, Boonsboro - Mold Removal
- Miscellaneous Household Item Repair, Boonsboro
- Miscellaneous Government, Boonsboro
- Miscellaneous Professional, Boonsboro
- Money Change Machines, Boonsboro
- Money Counting & Wrapping, Boonsboro
- Mortgages & Loans, Boonsboro
- Motor Vehicle, Boonsboro
- Moving & Storage Consultants, Boonsboro
- Moving Companies, Boonsboro
- Mulch, Peat & Moss Products, Boonsboro
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