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- Map of Frankville Township, Iowa ZIP Codes
Map of ZIP Codes in Frankville Township, Iowa
List of ZIP Codes in Frankville Township, Iowa |
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| ZIP Code | ZIP Code City Name | Population | ZIP Code Type |
| Decorah | 13864 | Non-Unique |
| Castalia | 558 | Non-Unique |
| Ossian | 1505 | Non-Unique |
| Postville | 3285 | Non-Unique |
| Waukon | 6303 | Non-Unique |