Native American Heritage

Bureau of Indian Affairs Central Classified Files, 1907–1975

The National Archives in Washington, DC (Archives 1), houses headquarters records of the Bureau of Indian Affairs (BIA) in Record Group 75.  These records include the Central Classified Files (CCF), which serve as the main correspondence series for BIA headquarters during the twentieth century.

Unlike BIA headquarters’ correspondence before 1907, which is segregated into separate series for incoming and outgoing letters (“letters received” and “letters sent”), the CCF consists of consolidated files that can include both incoming and outgoing correspondence. The documents placed within a consolidated file generally pertain to the same subject and can span a period of several years or more, as BIA officials added documents to the file over time.

CCF files can include letters received, copies of letters sent, reports, memoranda, minutes, petitions, leases, contracts, affidavits, applications, certificates, licenses, permits, bonds, wills, other legal documents, tables, circulars, accounting records, clippings, photographs, diagrams, blueprints, and occasional maps.  However, not all CCF files contain each of these documents.


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Cover Page from File 12540-1950-307.4-Alaska

Central Classified Files, 1940–1957 (National Archives Identifier 1719104)

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Resolution from File 12540-1950-307.4-Alaska

Central Classified Files, 1940–1957 (National Archives Identifier 1719104)

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Map showing Noatak claims. Part of File 12540-1950-307.4-Alaska

Central Classified Files, 1940–1957 (National Archives Identifier 1719104)


The CCF is grouped into three chronological series within Record Group 75:

  • Entry PI-163 121A: CCF for the years 1907–1939 (National Archives Identifier 300324)
  • Entry PI-163 121B: CCF for the years 1940–1957 (National Archives Identifier 1719104)
  • Entry PI-163 121C: CCF for the years 1958–1975 (National Archives Identifier 1719105)


Each CCF series is arranged by the BIA agency, jurisdiction, school, or field unit, and thereunder by a subject-based decimal classification system, year, and letter number. A list of subjects and their corresponding decimal numbers is available in the Archives 1 Consultation Room and also as a PDF.

The Archives 1 Consultation Room also has lists of the BIA agencies and jurisdictions for which there are records in each CCF series. BIA agencies and jurisdictions changed over time, as did the tribes that they served, so the same agencies and jurisdictions are not always represented in each CCF series.

Sometimes, additional research must be undertaken to discover which BIA agency served a particular tribe in a particular time period. The Navigating Record Group 75 page includes a list of BIA agencies and the tribes that they served. The list is arranged by state.

Each CCF series also has a “General Services” category, which typically contains correspondence sent or received by the BIA’s upper-level administrators. These records tend to document policy decisions, administrative actions affecting multiple tribes, tribes not represented by a particular agency, and other topics.


A complete citation for a CCF file consists of the following elements:

  • Letter number, which is usually taken from the first letter (base letter) of the file.
  • Year, which usually reflects the date of the first letter (base letter) in the file.
  • Decimal classification, which represents a particular subject as determined by the BIA. (See the decimal classification scheme for a list of subjects.)
  • BIA agency or jurisdiction, which refers to the BIA office, school, or other field unit that generated or received the correspondence.

An example of a CCF citation would be: 12540-1950-307.4-Alaska.


CCF Before 1942

Archives 1 has an index to the CCF files between 1907 and 1942 (National Archives Identifier 2108754). This index provides the four elements (letter number, year, decimal classification, and BIA agency/jurisdiction) needed to request a CCF file.

The CCF index is currently being digitized and added to the National Archives Catalog. For more information about this series, please see Numerical Index to the Central Classified Files.

Please note that the CCF index is more complete than the actual CCF series. Some index cards might refer to files that are no longer extant.

CCF After 1942

Archives 1 does not have a comprehensive index to the CCF series dating after 1942. Researchers must request these files by the BIA agency/jurisdiction and the subject-based decimal numbers. Please email the Archives 1 Reference Branch at for further assistance.

The CCF files from 1907 to 1939 (Entry PI-163 121A) are also more complete than the files from 1940 to 1975 (Entries PI-163 121B and PI-163 121C). The BIA retains custody of many files dating from 1940 to 1975. The BIA also retains most records that postdate 1975.