Derby, Iowa
During the 2010 census, there were 115 people, 47 households, and 31 families living in the city. There were about 442.3 inhabitants per square mile (170.8/km2). There were 55 homes at an average density of 211.5 per square mile (81.7/km2). Most of the city is white and 0.9% from two or more races.