- Machine Shop, Millersville
- Machine Shop & Tool Repair Service, Millersville
- Machinery, Supplies & Equipment - Business Production Related, Millersville
- Machinery, Supplies & Equipment - Business Supplies Related, Millersville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Millersville
- Magicians & Hypnotist Entertainers, Millersville
- Mailbox Rental Services, Millersville
- Mailing, Delivery & Courier Service, Millersville
- Maintenance, Cleaning & Sanitation, Millersville
- Major Appliance Repair & Service, Millersville
- Major Appliances, Millersville - Household & Kitchen
- Management Consultants & Services, Millersville
- Manicurists & Pedicurists, Millersville
- Manufacturers Agents & Representatives, Millersville
- Manufacturers Representative, Millersville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Millersville
- Manufacturing Products, Millersville
- Marinas & Marina Services, Millersville
- Market Research & Analysis , Millersville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Millersville
- Martial Arts & Self Defense Schools, Millersville
- Masonry Contractors, Millersville - Stone Mason, Brick Mason - Install & Repair
- Masonry Contractors Commercial & Industrial, Millersville
- Masonry Materials & Supplies, Millersville
- Mechanical Engineer, Millersville - Mechanical Engineering Service
- Medical & Dental Management, Millersville
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Millersville
- Medical Groups & Clinics, Millersville - Medical & Health Centers
- Medical Management & Business Administration Service, Millersville
- Medical Supplies & Equipment, Millersville
- Membership Sports & Recreation Clubs, Millersville
- Men's & Boys Clothing & Accessories Stores, Millersville
- Mental Health Specialists, Millersville - Psychologist, Psychiatrist, Psychotherapist, etc
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- Methodist Church, Millersville
- Mexican Restaurants, Millersville
- Mildew Removal & Control, Millersville - Mold Removal
- Millwork Contractors, Millersville
- Mini & Self Storage, Millersville
- Ministries Church, Millersville
- Miscellaneous Business Product Repair, Millersville
- Miscellaneous Household Item Repair, Millersville
- Miscellaneous Government, Millersville
- Miscellaneous Manufacturing, Millersville
- Miscellaneous Personal Services, Millersville
- Miscellaneous Photographers, Millersville
- Miscellaneous Professional, Millersville
- Mobile Home Parks & Communities , Millersville
- Modular & Mobile Homes For Sale, Millersville - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Millersville
- Mortgage Companies, Millersville
- Mortgage Contracts & Services, Millersville
- Mortgages & Loans, Millersville
- Mortgages Commercial & Industrial, Millersville
- Motor Vehicle, Millersville
- Motor Vehicle Rental & Leasing, Millersville
- Moving & Storage Supplies & Equipment, Millersville
- Moving Companies, Millersville
- Moving Supplies & Equipment Rental, Millersville
- Moving Truck Rental , Millersville
- Muffler Shop & Exhaust Systems, Millersville
- Museums, Millersville
- Music, Millersville
- Music Lessons, Millersville
- Music Lessons - Instrumental, Millersville
- Musical Recording Services, Millersville
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