This collection consists of official letters to and from James Denver during his military service in the Mexican-American War, as well as personal letters to Denver's brother Arthur of Platte City, Missouri; his sister Elizabeth A. Johns of Wilmington, Ohio; and his wife Louise Catherine Denver of Wilmington, OH. These latter letters were written while he was serving as governor of the Kansas Territory.

Business papers and correspondence of James William Denver from 1839-1912. Includes a diary dated May 20, 1850-September 5, 1850, with miscellaneous notes.