- Machine Shop & Tool Repair Service, Lock Haven
- Machinery, Supplies & Equipment - Business Production Related, Lock Haven
- Machinery, Supplies & Equipment - Business Supplies Related, Lock Haven
- Machinery, Supplies & Equipment - Construction & Contractor Related, Lock Haven
- Mailing, Delivery & Courier Service, Lock Haven
- Maintenance, Cleaning & Sanitation, Lock Haven
- Major Appliances, Lock Haven - Household & Kitchen
- Management Consultants & Services, Lock Haven
- Manicurists & Pedicurists, Lock Haven
- Manufacturing, Lock Haven
- Marriage & Family Counselors, Lock Haven
- Masonry Contractors, Lock Haven - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Lock Haven
- Massage Therapists & Professional, Lock Haven
- Massage Therapy, Lock Haven
- Material Handling Equipment, Lock Haven - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical & Health Service Organizations, Lock Haven
- Medical Billing Services, Lock Haven
- Medical Groups & Clinics, Lock Haven - Medical & Health Centers
- Medical Supplies & Equipment, Lock Haven
- Membership Sports & Recreation Clubs, Lock Haven
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- Mental Health Specialists, Lock Haven - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Lock Haven
- Mildew Removal & Control, Lock Haven - Mold Removal
- Mining, Lock Haven
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Lock Haven
- Miscellaneous Government, Lock Haven
- Miscellaneous Personal Services, Lock Haven
- Miscellaneous Professional, Lock Haven
- Money Transfer Service, Lock Haven
- Mortgage Bankers & Correspondents, Lock Haven
- Mortgage Companies, Lock Haven
- Mortgages & Loans, Lock Haven
- Motor Vehicle, Lock Haven
- Motor Vehicle Rental & Leasing, Lock Haven
- Motorcycle Parts, Accessories & Dealers, Lock Haven
- Movie Theaters, Lock Haven
- Moving Truck Rental , Lock Haven
- Museums, Lock Haven
- Music, Lock Haven
- Music Schools, Lock Haven
- Musical Instruments & Equipment Stores, Lock Haven
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