- Mail Delivery Service, Aurora
- Management Consultants & Services, Aurora
- Manufacturing, Aurora
- Manufacturing & Industrial Consultants, Aurora
- Manufacturing Products, Aurora
- Marine Contractors & Designers, Aurora
- Meeting & Event Planning Services, Aurora - Conference Consultants
- Mining, Aurora
- Mining Contractors, Aurora - Mining Companies, Contractors & Brokers
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- Mining, Crude-Oil Production, Aurora - Mining Companies
- Ministries Church, Aurora
- Miscellaneous Government, Aurora
- Miscellaneous Professional, Aurora
- Mission Churches, Aurora
- Mortgage Bankers & Correspondents, Aurora
- Motor Vehicle, Aurora
- Muffler Shop & Exhaust Systems, Aurora
- Museums, Aurora
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