- Machinery, Supplies & Equipment - Business Supplies Related, Davenport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Davenport
- Manufacturing, Davenport
- Marinas & Marina Services, Davenport
- Marriage & Family Counselors, Davenport
- Masonry Materials & Supplies, Davenport
- Membership Sports & Recreation Clubs, Davenport
- Mental Health Specialists, Davenport - Psychologist, Psychiatrist, Psychotherapist, etc
- Merchandise Sales Events, Davenport
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- Methodist Church, Davenport
- Mexican Restaurants, Davenport
- Miscellaneous Government, Davenport
- Miscellaneous Professional, Davenport
- Monuments, Tombstones, Markers & Memorials, Davenport
- Mortgage Bankers & Correspondents, Davenport
- Mortgage Contracts & Services, Davenport
- Mortgages & Loans, Davenport
- Motor Vehicle, Davenport
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