- Machine Shop & Tool Repair Service, Loudonville
- Machinery, Supplies & Equipment - Business Supplies Related, Loudonville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Loudonville
- Manufacturing, Loudonville
- Manufacturing Products, Loudonville
- Masonry Materials & Supplies, Loudonville
- Medical Groups & Clinics, Loudonville - Medical & Health Centers
- Membership Sports & Recreation Clubs, Loudonville
- Metal Products, Loudonville
- Methodist Church, Loudonville
- Mini & Self Storage, Loudonville
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- Miscellaneous Government, Loudonville
- Miscellaneous Personal Services, Loudonville
- Monuments, Tombstones, Markers & Memorials, Loudonville
- Mortgage Bankers & Correspondents, Loudonville
- Motor Vehicle, Loudonville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Loudonville
- Motorcycle Repair & Service, Loudonville
- Motorcycles Paint & Refinishing, Loudonville
- Movie Theaters, Loudonville
- Museums, Loudonville
- Music, Loudonville
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