Johnston, Iowa

1 ZIP code · Central time

ZIP codes (largest first)

50131 · 24,583
Population24,384
StateIowa
CountyPolk County
Time zoneCentral
Land area19.49 sq mi

Area codes in this area

515

These are the area codes that most often serve Johnston (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Find the ZIP+4 for an address in Johnston

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Population: U.S. Census Bureau, ACS 5-year estimates, 2024.