- Machine Shop & Tool Repair Service, Morrisville
- Machinery, Supplies & Equipment - Business Supplies Related, Morrisville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Morrisville
- Major Appliances, Morrisville - Household & Kitchen
- Management Consultants & Services, Morrisville
- Manufacturing, Morrisville
- Manufacturing Products, Morrisville
- Manufacturing Services, Morrisville
- Marriage & Family Counselors, Morrisville
- Masonry Materials & Supplies, Morrisville
- Mechanical Engineer, Morrisville - Mechanical Engineering Service
- Medical Alert Systems, Morrisville - Medical Alarms - PERS
- Medical Supplies & Equipment, Morrisville
- Mental Health Specialists, Morrisville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Morrisville
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- Micro Breweries, Morrisville
- Midwives, Morrisville
- Miscellaneous Business Services, Morrisville
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Morrisville
- Miscellaneous Government, Morrisville
- Miscellaneous Manufacturing, Morrisville
- Mortgage Bankers & Correspondents, Morrisville
- Motion Picture Pre & Post Production Services, Morrisville
- Motor Vehicle, Morrisville
- Motor Vehicle Rental & Leasing, Morrisville
- Movie Theaters, Morrisville
- Moving Truck Rental , Morrisville
- Muffler Shop & Exhaust Systems, Morrisville
- Museums, Morrisville
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