- Major Appliances, Jefferson - Household & Kitchen
- Management Consultants & Services, Jefferson
- Manufacturing, Jefferson
- Marriage & Family Counselors, Jefferson
- Masonry Materials & Supplies, Jefferson
- Medical & Health Service Organizations, Jefferson
- Medical Groups & Clinics, Jefferson - Medical & Health Centers
- Medical Supplies & Equipment, Jefferson
- Meeting & Event Planning Services, Jefferson - Conference Consultants
- Mental Health Specialists, Jefferson - Psychologist, Psychiatrist, Psychotherapist, etc
- Mexican Restaurants, Jefferson
- Ministries Church, Jefferson
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- Miscellaneous Business Credit Institutions & Services, Jefferson
- Miscellaneous Government, Jefferson
- Miscellaneous Personal Services, Jefferson
- Miscellaneous Professional, Jefferson
- Mortgage Bankers & Correspondents, Jefferson
- Mortgages & Loans, Jefferson
- Motor Vehicle, Jefferson
- Motorcycle Parts, Accessories & Dealers, Jefferson
- Muffler Shop & Exhaust Systems, Jefferson
- Museums, Jefferson
- Musical Instruments Repair, Sales & Service, Jefferson
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