- Machine Shop, Louisville
- Machine Shop & Tool Repair Service, Louisville
- Machinery, Supplies & Equipment - Business Production Related, Louisville
- Machinery, Supplies & Equipment - Business Supplies Related, Louisville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Louisville
- Major Appliances, Louisville - Household & Kitchen
- Management Consultants & Services, Louisville
- Manicurists & Pedicurists, Louisville
- Manufacturing, Louisville
- Manufacturing Products, Louisville
- Masonry Contractors, Louisville - Stone Mason, Brick Mason - Install & Repair
- Medical & Dental Management, Louisville
- Medical Business Management Services, Louisville
- Medical Management & Business Administration Service, Louisville
- Medical Supplies & Equipment, Louisville
- Mennonite Church, Louisville
- Metal Lockers, Louisville
- Methodist Church, Louisville
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- Mexican Restaurants, Louisville
- Mini & Self Storage, Louisville
- Ministries Church, Louisville
- Miscellaneous Household Item Repair, Louisville
- Miscellaneous Agriculture, Louisville
- Miscellaneous Government, Louisville
- Miscellaneous Personal Services, Louisville
- Miscellaneous Photographers, Louisville
- Miscellaneous Professional, Louisville
- Mobile Home Contractors, Louisville
- Mobile Home Improvements & Repairs, Louisville
- Mobile Home Parks & Communities , Louisville
- Motor Vehicle, Louisville
- Motor Vehicle Rental & Leasing, Louisville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Louisville
- Motorcycle Repair & Service, Louisville
- Moving Truck Rental , Louisville
- Mulch, Peat & Moss Products, Louisville
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