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ZIP Code 63366 – O Fallon, MO

O Fallon, Missouri · St. Charles County · Central time

ZIP code63366
CityO Fallon
StateMissouri
CountySt. Charles County
Population54,769
Time zoneCentral · local time
ZIP typeStandard (has a Census ZCTA area)
Land area69.28 sq mi
Center (lat, long)38.8575, -90.7253

Area codes in this area

636

These are the area codes that most often serve ZIP 63366 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

Map

Nearby ZIP codes

63369 Old Monroe · 6.2 mi63367 Lake Saint Louis · 6.9 mi63376 Saint Peters · 7.2 mi63368 O Fallon · 7.3 mi63385 Wentzville · 8.2 mi62036 Golden Eagle · 8.4 mi63338 Cottleville · 8.6 mi63389 Winfield · 10.2 mi

About ZIP 63366

ZIP code 63366 is assigned to O Fallon, Missouri. It lies in St. Charles County. Its Census area covers about 69.28 square miles of land. The closest neighboring ZIP is 63369 (Old Monroe), about 6.2 miles away.

Every address in 63366 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.

Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources