- Machine Shop & Tool Repair Service, Gettysburg
- Machinery Repair & Rebuild, Gettysburg
- Machinery, Supplies & Equipment - Business Supplies Related, Gettysburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Gettysburg
- Major Appliances, Gettysburg - Household & Kitchen
- Malls & Shopping Centers, Gettysburg
- Manufacturing, Gettysburg
- Marriage & Family Counselors, Gettysburg
- Masonry Materials & Supplies, Gettysburg
- Meat Market, Wholesale & Products, Gettysburg
- Membership Sports & Recreation Clubs, Gettysburg
- Mennonite Church, Gettysburg
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- Mental Health Specialists, Gettysburg - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Gettysburg
- Miscellaneous Government, Gettysburg
- Monuments, Tombstones, Markers & Memorials, Gettysburg
- Mortgage Bankers & Correspondents, Gettysburg
- Motor Vehicle, Gettysburg
- Motor Vehicle Rental & Leasing, Gettysburg
- Motorcycle Parts, Accessories & Dealers, Gettysburg
- Moving Supplies & Equipment Rental, Gettysburg
- Moving Truck Rental , Gettysburg
- Museums, Gettysburg
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