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Web rock valley, ia is a city located in sioux county, ia. Web find the only zip code for rock valley, ia, which is 51247, and get information on population, area, time zone,. Web find the zip code for any location in rock valley iowa with this interactive map and list of zip codes. Web zip code 51247 is located in rock valley iowa. Portions of 51247 are also in rock township (sioux county) and sioux. Web rock valley, ia 51247 zip code 51247 in rock valley, ia download zip code database load 51247 zip code map zip. Rock valley iowa has only. Web rock valley is a city in sioux county, iowa, the north western corner of iowa, united states, along the rock river.