- Machine Shop, Brookville
- Machine Shop & Tool Repair Service, Brookville
- Machine Shop Rotary Surface Grinding, Brookville - Tool Grinding & Sharpening
- Machinery Movers & Erectors, Brookville
- Machinery, Supplies & Equipment - Business Supplies Related, Brookville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Brookville
- Major Appliances, Brookville - Household & Kitchen
- Manufacturing, Brookville
- Manufacturing Products, Brookville
- Marketing, Brookville
- Masonry Contractors, Brookville - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Brookville
- Massage Therapists & Professional, Brookville
- Massage Therapy, Brookville
- Material Handling & Heavy Machinery & Equipment, Brookville
- Medical Supplies & Equipment, Brookville
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- Metal Stampings Manufacturers, Brookville
- Methodist Church, Brookville
- Miscellaneous Metal Work Manufacturers, Brookville
- Miscellaneous Personal Services, Brookville
- Mission Churches, Brookville
- Molds, Brookville
- Motor Vehicle, Brookville
- Motor Vehicle Rental & Leasing, Brookville
- Motorcycle & ATV Repair & Service, Brookville
- Motorcycle & Motor Scooters Dealers, Repair & Service, Brookville
- Motorcycle Repair & Service, Brookville
- Moving Truck Rental , Brookville
- Museums, Brookville
- Music, Brookville
- Musical Instruments & Equipment Stores, Brookville
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