O Fallon, Missouri ZIP Code - United States

The location O Fallon, MO has 4 differents ZIP Codes. Check the map below to check your ZIP Code.

	City Name	ZIP Code	ZIP Type	Estimated Population
O Fallon, MO	PRIMARY	63366	STANDARD	41.184
O Fallon, MO	ACCEPTABLE	63367	STANDARD	16.536
O Fallon, MO	PRIMARY	63368	STANDARD	35.097
O Fallon, MO	ACCEPTABLE	63376	STANDARD	63.056

Postal Zone of O Fallon, MO - USA

O Fallon, MO belongs to St. Charles county. Check the list of St. Charles county ZIP Code.

Check the list of Missouri ZIP Code.

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PRIMARY: means an the primary city name. Official city name, although the city name might also have another acceptable name.
ACCEPTABLE: means an adequate city name. City names that are abbreviated will frequently be listed as unacceptable because abbreviations are not an acceptable city name format.
IMPROPER/NOT ACCEPTABLE: Means an inadequate city name has been entered or received based on information entered.
UNIQUE: Assigned to a company, government agency, or entity with sufficient mail volume, based on average daily volume of letter size mail received, availability of ZIP Code numbers in the postal area, and the US mail service cost-benefit analysis.