- Machine Shop & Tool Repair Service, Louisa
- Machine Shop Rotary Surface Grinding, Louisa - Tool Grinding & Sharpening
- Machinery Movers & Erectors, Louisa
- Machinery, Supplies & Equipment - Business Production Related, Louisa
- Machinery, Supplies & Equipment - Business Supplies Related, Louisa
- Machinery, Supplies & Equipment - Construction & Contractor Related, Louisa
- Management Consultants & Services, Louisa
- Manicurists & Pedicurists, Louisa
- Manufacturing, Louisa
- Manufacturing Products, Louisa
- Map Publishers & Printers, Louisa
- Mapping & Topographical Services, Louisa
- Masonry Materials & Supplies, Louisa
- Mechanical Contractors, Louisa - Install, Service & Repair
- Medical Supplies & Equipment, Louisa
- Membership Sports & Recreation Clubs, Louisa
- Mental Health Specialists, Louisa - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Buildings, Louisa - Kits, Homes, Steel Buildings, etc
- Metal Specialties, Louisa
- Methodist Church, Louisa
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- Mexican Restaurants, Louisa
- Mining, Louisa
- Mining Contractors, Louisa - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Louisa - Mining Companies
- Miscellaneous Government, Louisa
- Miscellaneous Manufacturing, Louisa
- Miscellaneous Personal Services, Louisa
- Miscellaneous Photographers, Louisa
- Mortgages & Loans, Louisa
- Motion Picture & Television Production Services, Louisa
- Motion Picture Pre & Post Production Services, Louisa
- Motor Vehicle, Louisa
- Motor Vehicle Rental & Leasing, Louisa
- Moving Supplies & Equipment Rental, Louisa
- Moving Truck Rental , Louisa
- Museums, Louisa
- Music, Louisa
- Musical Instrument Rental, Louisa - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Louisa
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