 oto is a city in woodbury county, iowa, united states. it is part of the sioux city, ia&ndash;ne&ndash;sd metropolitan statistical area. the population was 108 at the 2010 census. ==geography== oto is located at  (42.283676, -95.894047). it is situated near the little sioux river. according to the united states census bureau, the city has a total area of , all of it land.{{cite web|title=us gazetteer files 2010|url=http://www.census.gov/geo/www/gazetteer/files/gaz_places_national.txt|publisher=[[united states censu
Cities_in_Iowa Cities_in_Woodbury_County,_Iowa Sioux_City_metropolitan_area