- Machine Shop & Tool Repair Service, Spencerport
- Machinery And Equipment Manufacturers, Spencerport
- Machinery, Supplies & Equipment - Business Production Related, Spencerport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Spencerport
- Magnetic Devices, Spencerport
- Magnets & Magnetic Devices, Spencerport
- Management Consultants & Services, Spencerport
- Manicurists & Pedicurists, Spencerport
- Manufacturing, Spencerport
- Manufacturing Products, Spencerport
- Marriage & Family Counselors, Spencerport
- Masonry Contractors, Spencerport - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Spencerport
- Massage Therapists & Professional, Spencerport
- Massage Therapy, Spencerport
- Mechanical Contractors, Spencerport - Install, Service & Repair
- Medical & Health Service Organizations, Spencerport
- Membership Sports & Recreation Clubs, Spencerport
- Mental Health Specialists, Spencerport - Psychologist, Psychiatrist, Psychotherapist, etc
- Mental Retardation & Developmentally Disabled Services, Spencerport
- Methodist Church, Spencerport
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- Mexican Restaurants, Spencerport
- Miscellaneous Business Product Repair, Spencerport
- Miscellaneous Government, Spencerport
- Miscellaneous Manufacturing, Spencerport
- Miscellaneous Motor Vehicles, Spencerport
- Miscellaneous Personal Services, Spencerport
- Miscellaneous Professional, Spencerport
- Mortgage Bankers & Correspondents, Spencerport
- Mortgages & Loans, Spencerport
- Motor Vehicle, Spencerport
- Motor Vehicle Rental & Leasing, Spencerport
- Motorcycle & Motor Scooters Dealers, Repair & Service, Spencerport
- Motorcycle Parts, Accessories & Dealers, Spencerport
- Motorcycle Repair & Service, Spencerport
- Moving Truck Rental , Spencerport
- Mulch, Peat & Moss Products, Spencerport
- Music, Spencerport
- Music Lessons, Spencerport
- Music Lessons - Instrumental, Spencerport
- Musical Instruments & Equipment Stores, Spencerport
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