- Machine Shop & Tool Repair Service, Summerville
- Machinery, Supplies & Equipment - Business Supplies Related, Summerville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Summerville
- Mail Delivery Service, Summerville
- Mailing, Delivery & Courier Service, Summerville
- Major Appliances, Summerville - Household & Kitchen
- Management Consultants & Services, Summerville
- Manicurists & Pedicurists, Summerville
- Manufacturing, Summerville
- Martial Arts & Self Defense Schools, Summerville
- Masonry Materials & Supplies, Summerville
- Mausoleums Developers, Summerville
- Membership Sports & Recreation Clubs, Summerville
- Mental Health Specialists, Summerville - Psychologist, Psychiatrist, Psychotherapist, etc
- Merle Norman Cosmetics, Summerville
- Methodist Church, Summerville
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- Mexican Restaurants, Summerville
- Millwork Contractors, Summerville
- Mini & Self Storage, Summerville
- Miscellaneous Government, Summerville
- Miscellaneous Photographers, Summerville
- Miscellaneous Professional, Summerville
- Mission Churches, Summerville
- Monuments, Tombstones, Markers & Memorials, Summerville
- Mortgage Bankers & Correspondents, Summerville
- Mortgages & Loans, Summerville
- Motor Vehicle, Summerville
- Motor Vehicle Rental & Leasing, Summerville
- Moving Supplies & Equipment Rental, Summerville
- Moving Truck Rental , Summerville
- Muffler Shop & Exhaust Systems, Summerville
- Museums, Summerville
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