Publisher
- Mississippi River Commission251
- Missouri River Commission11
- Morale Services Division17
- Motor Transport Corps5
- Mounted Service School10
- Municipal Board of Manila1
- Museum of Ethnology, Natural History, and Commerce2
- National Board for Promotion of Rifle Practice37
- National Guard Bureau75
- National Youth Administration3
- Nautical Almanac Office3
- Naval Academy1
- Naval Intelligence Office1
- Naval Observatory3
- Naval War Records Office1
- Navigation Bureau6
- New York Arsenal1
- New York Harbor Supervisor20
- Niagara Falls Committee1
- Northern and Northwestern Lake Survey1,210