Grundy County, Iowa ZIP Codes

Zip Code
City
Population ↓
50638Grundy Center3,441
50669Reinbeck2,439
50624Dike1,855
50621Conrad1,601
50680Wellsburg1,027
50642Holland577
50609Beaman377
50673Stout250
50657Morrison96

Overview of ZIP Codes in Grundy 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.
9
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 9 ZCTAs in Grundy County, Iowa (US Census).

Sources

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

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