- Machine Shop, New Oxford
- Machine Shop & Tool Repair Service, New Oxford
- Machinery, Supplies & Equipment - Business Production Related, New Oxford
- Machinery, Supplies & Equipment - Business Supplies Related, New Oxford
- Machinery, Supplies & Equipment - Construction & Contractor Related, New Oxford
- Mail Delivery Service, New Oxford
- Major Appliances, New Oxford - Household & Kitchen
- Manufacturing, New Oxford
- Manufacturing Products, New Oxford
- Marriage & Family Counselors, New Oxford
- Masonry Materials & Supplies, New Oxford
- Medical Diagnostic Clinics, New Oxford - Clinical Labs & Centers
- Medical Supplies & Equipment, New Oxford
- Mental Health Specialists, New Oxford - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, New Oxford - Iron Works
- Methodist Church, New Oxford
- Millwork Contractors, New Oxford
- Mini & Self Storage, New Oxford
- Ministries Church, New Oxford
- Miscellaneous Government, New Oxford
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- Miscellaneous Industry, New Oxford
- Miscellaneous Manufacturing, New Oxford
- Miscellaneous Personal Services, New Oxford
- Miscellaneous Photographers, New Oxford
- Miscellaneous Professional, New Oxford
- Mobile Home Parks & Communities , New Oxford
- Mortgage Bankers & Correspondents, New Oxford
- Motor Vehicle, New Oxford
- Motor Vehicle Rental & Leasing, New Oxford
- Motorcycle & Motor Scooters Dealers, Repair & Service, New Oxford
- Motorcycle Parts, Accessories & Dealers, New Oxford
- Motorcycle Repair & Service, New Oxford
- Motorcycles Paint & Refinishing, New Oxford
- Moving Companies, New Oxford
- Moving Services - Labor & Material, New Oxford
- Moving Supplies & Equipment Rental, New Oxford
- Moving Truck Rental , New Oxford
- Music, New Oxford
- Musical Instruments & Equipment Stores, New Oxford
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