The National Archives holds records for almost 7000 students who attended the Carlisle Indian School in Carlisle, Pa. Records for the school indicate that there were a total of 12,000 students, so some records appear to be missing from the online archives.
Of these nearly 7000 students, the second most from any one tribe was 705 students from the Sioux, or about 10%. The Chippewa had 813.
These Carlisle records span the time from 1879 when the school first opened until 1918 when the school closed.
The Sioux sent many students when the school first opened. In the archives we also find a photo of the Sioux boys as they were dressed on arrival at the Carlisle School on October 5th, 1879.