- Machine Shop & Tool Repair Service, Altoona
- Machinery And Equipment Manufacturers, Altoona
- Machinery Movers & Erectors, Altoona
- Machinery, Supplies & Equipment - Business Supplies Related, Altoona
- Machinery, Supplies & Equipment - Construction & Contractor Related, Altoona
- Mailing, Delivery & Courier Service, Altoona
- Management Consultants & Services, Altoona
- Manicurists & Pedicurists, Altoona
- Manifold Business Forms Manufacturers, Altoona
- Manufactured & Mobile Home Movers & Transporting, Altoona
- Manufacturing, Altoona
- Manufacturing Products, Altoona
- Marriage & Family Counselors, Altoona
- Masonry Contractors, Altoona - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Altoona
- Massage Therapy, Altoona
- Material Handling & Heavy Machinery & Equipment, Altoona
- Material Handling Equipment, Altoona - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Supplies & Equipment, Altoona
- Mental Health Specialists, Altoona - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Coating & Allied Services, Altoona
- Metal Services, Altoona
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- Metal Tanks, Altoona
- Methodist Church, Altoona
- Mexican Restaurants, Altoona
- Mini & Self Storage, Altoona
- Miscellaneous Government, Altoona
- Miscellaneous Industry, Altoona
- Miscellaneous Manufacturing, Altoona
- Miscellaneous Personal Services, Altoona
- Miscellaneous Photographers, Altoona
- Miscellaneous Professional, Altoona
- Mortgage Bankers & Correspondents, Altoona
- Mortgage Contracts & Services, Altoona
- Mortgages & Loans, Altoona
- Motion Picture & Television Production Services, Altoona
- Motion Picture Dists & Producers, Altoona
- Motor Vehicle, Altoona
- Motor Vehicle Rental & Leasing, Altoona
- Motorcycle & ATV Repair & Service, Altoona
- Motorcycle & Motor Scooters Dealers, Repair & Service, Altoona
- Motorcycle Repair & Service, Altoona
- Moving Truck Rental , Altoona
- Muffler Shop & Exhaust Systems, Altoona
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