- National Council of Jewish Women Greater Minneapolis Records (4)
- National Council of YMCAs of India (1)
- National Council of the Young Men's Christian Associations of the United States of America (1)
- National Council of the Young Men's Christian Associations of the United States of America. Colored Work Department. (124)
- National Federation of Settlements and Neighborhood Centers (95)
- National Film Music Council (1)
- National Florence Crittenton Mission (6)
- National Geographic Society (U.S.) (7)
- National Geographic Society (U.S.). (1)
- National Geographic Society (U.S.). Cartographic Division (6)
- National Geographic Society (U.S.). Map Department (3)
- National Grange (1)
- National Guild of Community Music Schools (3)
- National Highways Association (14)
- National Highways Association. (4)
- National Nurseries (1)
- National Publishing Company (Boston, Mass.) (1)
- National Railway Publication Company (1)
- National Recreation Association (34)
- National Register of Historic Places (71)
