Farmington, Missouri

1 ZIP code · Central time

ZIP codes (largest first)

63640 · 29,263
Population18,282
StateMissouri
CountySt. Francois County
Time zoneCentral
Land area9.49 sq mi

Area codes in this area

235573

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

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