- Machinery And Equipment Manufacturers, Williamsville
- Machinery, Supplies & Equipment - Business Production Related, Williamsville
- Machinery, Supplies & Equipment - Business Supplies Related, Williamsville
- Magazine & Newspaper Stands, Williamsville - Dealers & Distributors
- Mailbox Rental Services, Williamsville
- Mailing, Delivery & Courier Service, Williamsville
- Management Consultants & Services, Williamsville
- Manicurists & Pedicurists, Williamsville
- Manufacturers Agents & Representatives, Williamsville
- Manufacturers Representative, Williamsville - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Williamsville
- Manufacturing Products, Williamsville
- Marinas & Aquariums, Williamsville
- Market Research & Analysis , Williamsville - Market Analysis, Business & Economic Research
- Marriage & Family Counselors, Williamsville
- Martial Arts & Self Defense Schools, Williamsville
- Maternity Clothes & Clothing Stores, Williamsville - Maternity Dress, Gown, Swimwear, Underwear & More
- Meat Market, Wholesale & Products, Williamsville
- Medical & Health Service Organizations, Williamsville
- Medical Research, Williamsville
- Medical Research & Development, Williamsville - Medical Information & Research
- Medical Supplies & Equipment, Williamsville
- Mental Health Specialists, Williamsville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandising & Pricing Equipment, Williamsville
- Metal Buildings, Williamsville - Kits, Homes, Steel Buildings, etc
- Metaphysical Churches, Williamsville
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- Methodist Church, Williamsville
- Mexican Restaurants, Williamsville
- Microfilm & Imaging Service, Equipment & Supplies , Williamsville
- Mini & Self Storage, Williamsville
- Miscellaneous Business Credit Institutions & Services, Williamsville
- Miscellaneous Household Item Repair, Williamsville
- Miscellaneous Business Services, Williamsville
- Miscellaneous Government, Williamsville
- Miscellaneous Manufacturing, Williamsville
- Miscellaneous Personal Services, Williamsville
- Miscellaneous Photographers, Williamsville
- Miscellaneous Professional, Williamsville
- Modeling & Talent Agencies, Williamsville
- Mortgage Bankers & Correspondents, Williamsville
- Mortgages & Loans, Williamsville
- Motion Picture Pre & Post Production Services, Williamsville
- Motor Vehicle, Williamsville
- Motor Vehicle Rental & Leasing, Williamsville
- Moving & Storage Supplies & Equipment, Williamsville
- Moving Companies, Williamsville
- Muffler Shop & Exhaust Systems, Williamsville
- Music, Williamsville
- Music Entertainment, Williamsville
- Musical Instruments & Equipment Stores, Williamsville
- Musicians, Bands & Disc Jockeys, Williamsville
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