 The community was originally named for Nat Whittum, an original settler who was killed at the site in 1891.A post office was established at Whittum in 1894; however, its name was changed to Blue in 1898, because everyone knew where the Blue River was but Whittum was not known.Blue has a ZIP Code of 85922; in 2000, the population of the 85922 ZCTA was 36.