Hannibal, Missouri

1 ZIP code · Central time

ZIP codes (largest first)

63401 · 21,489
Population16,771
StateMissouri
CountyMarion County
Time zoneCentral
Land area16.01 sq mi

Area codes in this area

235573

These are the area codes that most often serve Hannibal (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 Hannibal

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