- National Water Commission7
- National Water Resources, Select Committee on56
- National Waterways Commission15
- National Weather Service109
- National Woman's Liberty Loan Committee8
- National Youth Administration54
- National Zoological Park31
- National office of Vital Statistics2
- Naturalization Bureau138
- Naturalization, Commission On1
- Nautical Almanac Office219
- Nautical Almanac Office (Naval Observatory, Equipment Bureau, Navy Department)6
- Navajo-Hopi Indian Administration Joint Committee1
- Naval Academy162
- Naval Academy (Navigation Bureau, Navy Department)7
- Naval Academy, Annapolis51
- Naval Affairs Committee1,491
- Naval Affairs Committee, House2,208
- Naval Affairs Committee, Senate1,440
- Naval Affairs, Committee on57