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Zip Code 63303 — Saint Charles, MO

63303 is a ZIP Code associated with Saint Charles, MO, located within St. Charles. The postal region supports an estimated population of 46,089 residents across Data Pending housing units, with a population density of 900.8 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (38.740130, -90.542660)

Data MetricLocal Statistic
Postal / Zip Code63303
Primary CitySaint Charles
State / ProvinceMO
CountySt. Charles
Total Population46,089
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density900.8 people/sq mi
TimezoneAmerica/Chicago

How 63303 Compares

MetricZIP 63303St. Charles CountyMO State Average
Population46,089416,4866,191,989
Median IncomeData PendingN/AN/A
Population Density900.8 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 63146Saint Louis4.5 mi30,678N/A
Zip 63045Earth City4.6 miN/AN/A
Zip 63043Maryland Heights4.7 mi21,924N/A
Zip 63376Saint Peters5.7 mi74,962N/A
Zip 63017Chesterfield6.1 mi43,243N/A

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 →