- Machine Shop, Williamsport
- Machine Shop & Tool Repair Service, Williamsport
- Machinery And Equipment Manufacturers, Williamsport
- Machinery, Supplies & Equipment - Business Production Related, Williamsport
- Machinery, Supplies & Equipment - Business Supplies Related, Williamsport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Williamsport
- Magicians & Hypnotist Entertainers, Williamsport
- Mail Delivery Service, Williamsport
- Mailing, Delivery & Courier Service, Williamsport
- Manufacturers Agents & Representatives, Williamsport
- Manufacturers Representative, Williamsport - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Williamsport
- Manufacturing Products, Williamsport
- Masonry Contractors, Williamsport - Stone Mason, Brick Mason - Install & Repair
- Membership Sports & Recreation Clubs, Williamsport
- Mennonite Church, Williamsport
- Metal Detecting Equipment, Williamsport
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- Metal Working Machinery, Williamsport
- Methodist Church, Williamsport
- Ministries Church, Williamsport
- Miscellaneous Government, Williamsport
- Miscellaneous Manufacturing, Williamsport
- Miscellaneous Personal Services, Williamsport
- Miscellaneous Professional, Williamsport
- Mortgage Bankers & Correspondents, Williamsport
- Mortgages & Loans, Williamsport
- Motor Vehicle, Williamsport
- Motor Vehicle Rental & Leasing, Williamsport
- Motorcycle Parts, Accessories & Dealers, Williamsport
- Moving Companies, Williamsport
- Mulch, Peat & Moss Products, Williamsport
- Museums, Williamsport
- Music, Williamsport
- Musical Instruments & Equipment Stores, Williamsport
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