Located at the foot of the San Gabriel Mountains, modern Glendora was founded on April 1, 1887 by George D. Whitcomb
who moved to California from Illinois in the early 1880s.
Whitcomb was the founder of the Whitcomb Locomotive Works in Chicago and Rochelle, Illinois.
devised the name Glendora by combining the name of his
wife, Leadora Bennett Whitcomb, with the location of his
home in a glen of the San Gabriel Mountains.