The Sumner High School records date from 1906 to 2001 and are arranged in five series: School Information, Alumni Information, Artifacts, Audio-Visual Materials, and Photographs.

Within School Information are five subseries: Activities, Administration, Events, PTA, and Miscellaneous. These subseries contain such papers as correspondence, clippings, programs, facility information, and faculty information.

There are three subseries within Alumni Information: Alumni Association, Classes, and Graduate Information. These records include programs, correspondence, and reunion information. Within Classes are documents relating to specific class years. Graduate Information includes documents related to specific SHS graduates, some of which does not directly relate to the school.

The Artifacts series consists of trophies, class keys, and reunion souvenirs.

The Audio-visual Materials consist of twelve reel-to-reel audio tapes and eight reel-to-reel video tapes, all of which are housed with the manuscript items, and four videocassettes. Videocassettes are located at RH Video 22.

Folder arrangement within each series is generally alphabetical by topic, with chronological arrangement of items within each folder. Within the Classes subseries, folders are arranged chronologically by class year when a specific class is concerned.

Photographs from the collection are located at RH MS-P 1137. Arrangement mirrors that used for the papers. Oversize photographs are located at RH MS-P 1137 (f) and RH MS-P 1137(ff). Other oversize items are located at RH MS Q289 and RH MS R245.