O'Brien County, Iowa ZIP Codes

Zip Code
City
Population ↓
51346Hartley2,247
51248Sanborn1,534
51245Primghar1,377
51046Paullina1,326
51058Sutherland1,096
51022Granville960
51231Archer562
51009Calumet113

Overview of ZIP Codes in O'Brien County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
8
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 8 ZCTAs in O'Brien County, Iowa (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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