Home > MO > St. Charles County > O'Fallon > Zip 63366

Zip Code 63366 — O'Fallon, MO

ZIP Code 63366 is associated with O'Fallon, MO, in St. Charles County. The listed population estimate is 54,769; estimated density is 305.2 people per square mile. Among records with population estimates, it ranks #2 of 14 in St. Charles County and #5 of 1,021 in MO.
Page generated: 2026-10-08. This is not the source data release date.

📍 View location on OpenStreetMap (38.859180, -90.719640)

Data MetricLocal Statistic
Postal / Zip Code63366
Primary CityO'Fallon
State / ProvinceMO
CountySt. Charles
Total Population54,769
Population Density305.2 people/sq mi
TimezoneAmerica/Chicago

How 63366 Compares

MetricZIP 63366St. Charles County recordsMO records
Population estimate54,769416,486 (sum)6,191,989 (sum)
Population Density305.2 /sq mi----
County population rank#2 of 14----
State population rank#5 of 1,021----

Regional sums combine the population estimates in the listed ZIP records; they are not official county or state population totals.

Explore More ZIP Codes

Nearby ZIP Codes in MO

ZIP CodeCityDistancePopulation estimate
ZIP 63369Old Monroe6.3 mi2,822
ZIP 63376Saint Peters6.9 mi74,962
ZIP 63367Lake Saint Louis6.9 mi29,725
ZIP 63368O'Fallon7.5 mi46,966
ZIP 63385Wentzville8.5 mi51,330

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →