 The Castleton area also includes a now totally commercialized neighborhood around the intersection of 82nd Street and Allisonville Road once known as Allisonville from which the latter street originally derived its name.In 1970, Castleton became a so-called included town under the consolidated city-county government in Indianapolis called Unigov.However, the meaning of this included town status was somewhat uncertain, as under state law Indiana Code 36-3-1-4 sec.