There isn't really an answer to this question. The town is never mentioned in the movie, only in the books it is mentioned that she lives near Butterfield. However, Butterfield does not exist. In some publicity material Baum had for his 1904-05 comic page, Dorothy writes a letter to her old friends and the address given is "Uncle Henry's Farm Near Topeka." In the book Return to Oz, Dorthy lives outside Franklin, which does exist. There is a tourist attraction in Liberal, Kansas that called Dorothy's house, which is a relocated farmhouse built in 1907, along with the original model of the house used in the film and a collection of memorabilia. Hope this helps, although there is no real answer