- Management Consultants & Services, Ottsville
- Manufacturers Agents & Representatives, Ottsville
- Manufacturers Representative, Ottsville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Ottsville
- Manufacturing Products, Ottsville
- Marble, Ottsville
- Marriage & Family Counselors, Ottsville
- Masonry Materials & Supplies, Ottsville
- Massage Therapists & Professional, Ottsville
- Massage Therapy, Ottsville
- Mini & Self Storage, Ottsville
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- Miscellaneous Business Services, Ottsville
- Miscellaneous Government, Ottsville
- Miscellaneous Manufacturing, Ottsville
- Miscellaneous Personal Services, Ottsville
- Miscellaneous Professional, Ottsville
- Motor Vehicle, Ottsville
- Motor Vehicle Rental & Leasing, Ottsville
- Music, Ottsville
- Musical Instrument Rental, Ottsville - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Ottsville
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