- Mail Delivery Service, Elkton
- Mailing, Delivery & Courier Service, Elkton
- Management Consultants & Services, Elkton
- Manicurists & Pedicurists, Elkton
- Manufacturing, Elkton
- Masonry Contractors, Elkton - Stone Mason, Brick Mason - Install & Repair
- Mennonite Church, Elkton
- Methodist Church, Elkton
- Mexican Restaurants, Elkton
- Mini & Self Storage, Elkton
- Mining, Elkton
- Miscellaneous Government, Elkton
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- Miscellaneous Personal Services, Elkton
- Miscellaneous Photographers, Elkton
- Miscellaneous Professional, Elkton
- Mission Churches, Elkton
- Mortgage Bankers & Correspondents, Elkton
- Mortgages & Loans, Elkton
- Motor Vehicle, Elkton
- Motor Vehicle Rental & Leasing, Elkton
- Motorcycle Parts, Accessories & Dealers, Elkton
- Moving Truck Rental , Elkton
- Museums, Elkton
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