Delaware County, Iowa ZIP Codes

9 ZIP Codes

Zip Code
City
Population ↓
52057Manchester8,193
52040Dyersville5,584
52237Hopkinton1,830
52041Earlville1,468
52223Delhi1,199
52330Ryan940
52038Dundee463
52050Greeley422
52036Delaware135

Overview of ZIP Codes in Delaware 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 Delaware County, Iowa (US Census).

Sources

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

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