Publisher
- National Capital Park and Planning Commission14
- National Capital Planning Commission21
- National Capital Regional Planning Council9
- National Capital Sesquicentennial Commission1
- National Capital Transportation Agency4
- National Center for Education Statistics55
- National Center for Family Planning Service1
- National Center for Health Services Research2
- National Center for Health Services Research and Development53
- National Center for Health Statistics306
- National Center for Social Statistics122
- National Clearinghouse for Drug Abuse Information23
- National Clearinghouse for Smoking and Health24
- National Climatic Center9
- National Coast Defense Board2
- National Collection of Fine Arts56
- National Collection of Fine Arts (formerly National Gallery of Art)1
- National Commission for Manpower Policy4
- National Commission for Protection of Human Subjects of Biomedical and Behavioral Research1
- National Commission on Consumer Finance6