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ZIP Code Database - Facts & Stats

Data Last Updated: August 1, 2022

ZIP Codes for City of O Fallon, MO

O Fallon, MO Covers 4 ZIP Codes

ZIP CodeTypeCountyPopulationArea Code(s)
ZIP Code 63366StandardSaint Charles46,175636
ZIP Code 63367StandardSaint Charles19,433636
ZIP Code 63368StandardSaint Charles43,360636
ZIP Code 63376StandardSaint Charles70,828636

Timezone(s):Central (GMT -06:00)
Population:46,175 (More Details)
Male Population:22,606
Female Population:23,569
Median Age:36
ZIP Codes:4
Area Codes:1
Total Area:593 square miles (county)
Land Area:560 square miles (county)
Water Area:32 square miles (county)

O Fallon, MO Demographic Information *

There is no Census data for the city of O FALLON, MO. We have pulled information for the ZIP Code 63366 instead.
Total population46,175
Male population22,606
Female population23,569
Median age (years)35.6
White Population42,285
Black Population1,667
Indian Population134
Asian Population797
Hawaiian Population46
Hispanic Population1,301
Median age (Male)34.6
Median age (Female)36.6
Total households17,013
Family households (families)12,583
Average household size2.71
Average family size3.15
Total housing units17,758
* Demographic data is based on 2010 Census. Products


  1. U.S. Postal Service [Last Updated: 8/1/2022],
  2. Internal Data Creation [Last Updated: 8/1/2022],
  3. U.S. Geological Survey [Updated as needed],
  4. U.S. Census [Updated Yearly],
  5. U.S. Census 2010 [Decennial] [Last Updated: 1/1/2010],