- Machinery, Supplies & Equipment - Business Production Related, Millersville
- Machinery, Supplies & Equipment - Business Supplies Related, Millersville
- Maintenance, Cleaning & Sanitation, Millersville
- Major Appliances, Millersville - Household & Kitchen
- Manicurists & Pedicurists, Millersville
- Manufacturing, Millersville
- Marriage & Family Counselors, Millersville
- Massage Therapists & Professional, Millersville
- Massage Therapy, Millersville
- Mechanical Engineer, Millersville - Mechanical Engineering Service
- Medical Groups & Clinics, Millersville - Medical & Health Centers
- Membership Sports & Recreation Clubs, Millersville
- Mennonite Church, Millersville
- Mental Health Specialists, Millersville - Psychologist, Psychiatrist, Psychotherapist, etc
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- Methodist Church, Millersville
- Mildew Removal & Control, Millersville - Mold Removal
- Miscellaneous Household Item Repair, Millersville
- Miscellaneous Government, Millersville
- Miscellaneous Professional, Millersville
- Monuments, Tombstones, Markers & Memorials, Millersville
- Mortgage Bankers & Correspondents, Millersville
- Mortgage Companies, Millersville
- Motor Vehicle, Millersville
- Moving Companies, Millersville
- Music, Millersville
- Music Background Leased, Millersville
- Musical Instruments Repair, Sales & Service, Millersville
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