. "670000.0"^^ . "50068" . "673397.0"^^ . . "328.879"^^ . "170.8"^^ . "641" . "170.773"^^ . "0.0"^^ . "Derby is a city in Lucas County, Iowa, United States. The population was 115 at the 2010 census."@en . "115"^^ . "-5" . "Derby, Iowa"@en . "670000.0"^^ . . . . "673397.0"^^ . "-6" . . "329.0"^^ . .