- Machine Shop, Wellington
- Machine Shop & Tool Repair Service, Wellington
- Machinery, Supplies & Equipment - Business Supplies Related, Wellington
- Machinery, Supplies & Equipment - Construction & Contractor Related, Wellington
- Manicurists & Pedicurists, Wellington
- Manufacturing, Wellington
- Manufacturing Products, Wellington
- Masonry Materials & Supplies, Wellington
- Medical Supplies & Equipment, Wellington
- Membership Sports & Recreation Clubs, Wellington
- Mental Health Clinics, Wellington - Treatment Centers
- Mental Health Specialists, Wellington - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Wellington - Kits, Homes, Steel Buildings, etc
- Metal Finishers, Wellington
- Metal Heat Treating, Wellington
- Metal Plating & Polishing, Wellington
- Methodist Church, Wellington
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- Mexican Food, Wellington
- Mexican Restaurants, Wellington
- Mining, Wellington
- Miscellaneous Government, Wellington
- Miscellaneous Personal Services, Wellington
- Miscellaneous Photographers, Wellington
- Miscellaneous Professional, Wellington
- Monuments, Tombstones, Markers & Memorials, Wellington
- Mortgage Bankers & Correspondents, Wellington
- Motor Vehicle, Wellington
- Motor Vehicle Rental & Leasing, Wellington
- Movie Theaters, Wellington
- Moving Supplies & Equipment Rental, Wellington
- Moving Truck Rental , Wellington
- Museums, Wellington
- Music, Wellington
- Musical Recording Services, Wellington
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