The Idaho Territory was admitted as the 43rd state of the union on July 3, 1890. It ranks 14th among the 50 U.S. states in terms of total area. The name Idaho is thought to be derived from a Shoshone phrase meaning "gem of the mountains." Decades before national suffrage, Idaho became the fourth state in the country to give women the vote.

The digital collections of the Library of Congress contain a wide variety of material associated with Idaho. This guide compiles links to digital materials related to Idaho such as manuscripts, maps, and images that are available throughout the Library of Congress website. In addition, it provides links to external websites focusing on Idaho and a bibliography containing selected works for both general and younger readers.