- Machinery, Supplies & Equipment - Construction & Contractor Related, Waterville
- Mail Delivery Service, Waterville
- Mailing, Delivery & Courier Service, Waterville
- Management Consultants & Services, Waterville
- Manufacturing, Waterville
- Meeting & Event Planning Services, Waterville - Conference Consultants
- Methodist Church, Waterville
- Ministries Church, Waterville
- Miscellaneous Government, Waterville
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