Caldwell, city, seat (1892) of Canyon county, southwestern Idaho, U.S., on the Boise River. It originated (1883) as a construction camp for the Oregon Short Line Railroad and was named for Alexander Caldwell, the railroad president. Lake Lowell (formerly Deer Flat Reservoir), a unit in the Boise Irrigation Project, is to the south. Caldwell developed as a processing and shipping point for diversified farm products but has acquired some industry, notably, the manufacture of mobile homes; it has also been a commercial printing and book-production centre since the 1930s. Caldwell is the seat of Albertson College of Idaho, founded in 1891 as The College of Idaho. Inc. 1890. Pop. (2000) 25,967; (2010) 46,237.