- Machine Shop & Tool Repair Service, Middleburg
- Maintenance, Cleaning & Sanitation, Middleburg
- Manufacturing, Middleburg
- Marriage & Family Counselors, Middleburg
- Masonry Contractors, Middleburg - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Middleburg
- Meat Market, Wholesale & Products, Middleburg
- Medical Groups & Clinics, Middleburg - Medical & Health Centers
- Mennonite Church, Middleburg
- Mental Health Clinics, Middleburg - Treatment Centers
- Mental Health Specialists, Middleburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Middleburg
- Messenger Service, Middleburg - Message Receiving & Forwarding Service
- Methodist Church, Middleburg
- Mildew Removal & Control, Middleburg - Mold Removal
- Millwork Contractors, Middleburg
- Miscellaneous Household Item Repair, Middleburg
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- Miscellaneous Agriculture, Middleburg
- Miscellaneous Government, Middleburg
- Miscellaneous Industry, Middleburg
- Miscellaneous Manufacturing, Middleburg
- Miscellaneous Photographers, Middleburg
- Mobile Home Contractors, Middleburg
- Mobile Home Improvements & Repairs, Middleburg
- Modular & Mobile Homes For Sale, Middleburg - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Middleburg
- Mortgage Companies, Middleburg
- Mortgages & Loans, Middleburg
- Motor Vehicle, Middleburg
- Motor Vehicle Rental & Leasing, Middleburg
- Motorcycle Repair & Service, Middleburg
- Motorcycles Paint & Refinishing, Middleburg
- Moving Truck Rental , Middleburg
- Museums, Middleburg
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