Calhoun County, Iowa ZIP Codes

10 ZIP Codes

Zip Code
City
Population ↓
50579Rockwell City3,034
50563Manson2,505
51449Lake City1,950
50575Pomeroy696
50538Farnhamville661
50561Lytton585
51453Lohrville500
50586Somers272
50551Jolley96
50552Knierim76

Overview of ZIP Codes in Calhoun 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.
10
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 10 ZCTAs in Calhoun County, Iowa (US Census).

Sources

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

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