There are 9 zip codes in Fremont County, Iowa. The most populated is 51640, located in Hamburg. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
516401,503Hamburg
516531,501Tabor
516521,494Sidney
51639737Farragut
51649417Randolph
51654318Thurman
51650284Riverton
51648271Percival
51645247Imogene

Zip Codes in Fremont County, Iowa by Population (2024)