- Machine Tools , Ludlow
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ludlow
- Management Consultants & Services, Ludlow
- Manicurists & Pedicurists, Ludlow
- Manufacturing, Ludlow
- Market Research & Analysis , Ludlow - Market Analysis, Business & Economic Research
- Massage Therapists & Professional, Ludlow
- Massage Therapy, Ludlow
- Membership Sports & Recreation Clubs, Ludlow
- Memorial Libraries, Ludlow
- Metal Lockers, Ludlow
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- Methodist Church, Ludlow
- Mexican Restaurants, Ludlow
- Mining, Ludlow
- Mining Contractors, Ludlow - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Ludlow - Mining Companies
- Miscellaneous Business Services, Ludlow
- Miscellaneous Government, Ludlow
- Miscellaneous Professional, Ludlow
- Mortgage Bankers & Correspondents, Ludlow
- Motor Vehicle, Ludlow
- Museums, Ludlow
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