- Machine Shop & Tool Repair Service, Walkersville
- Machinery, Supplies & Equipment - Business Production Related, Walkersville
- Machinery, Supplies & Equipment - Business Supplies Related, Walkersville
- Mail Delivery Service, Walkersville
- Management Consultants & Services, Walkersville
- Manicurists & Pedicurists, Walkersville
- Manufacturing, Walkersville
- Martial Arts & Self Defense Schools, Walkersville
- Metal Repair Service & Blacksmith, Walkersville - Iron Works
- Methodist Church, Walkersville
- Ministries Church, Walkersville
- Miscellaneous Business Product Repair, Walkersville
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- Miscellaneous Agriculture, Walkersville
- Miscellaneous Business Services, Walkersville
- Miscellaneous Government, Walkersville
- Miscellaneous Personal Services, Walkersville
- Miscellaneous Professional, Walkersville
- Modular & Mobile Homes For Sale, Walkersville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Walkersville
- Mortgages & Loans, Walkersville
- Motion Picture Pre & Post Production Services, Walkersville
- Motor Vehicle, Walkersville
- Muffler Shop & Exhaust Systems, Walkersville
- Mulch, Peat & Moss Products, Walkersville
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