There are 13 zip codes in Sioux County, Iowa. The most populated is 51250, located in Sioux Center. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
51250Sioux Center9,667
51041Orange City7,016
51201Sheldon6,278
51247Rock Valley4,887
51023Hawarden3,469
51239Hull3,115
51003Alton1,761
51027Ireton1,421
51238Hospers1,401
51234Boyden1,179
51036Maurice676
51244Matlock147
51011Chatsworth77

Sioux County, Iowa Zip Codes by Population (2024)