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City ZIP codes · Missouri

Saint Charles, MO ZIP Codes

4 ZIP codes use the postal name Saint Charles, Missouri (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 3 residential and 1 for PO boxes or a single organization. Median household income runs from $85,308 in 63301 to $114,442 in 63304, 1.3 times as much (Census Bureau, ACS 2020-2024). Saint Charles's most populous ZIP code is 63301, with 52,667 people (ACS 2020-2024); 0% of its land is in the city of Saint Charles.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Saint Charles's ZIP codes?

63301: $85k median household income63303: $99k median household income63304: $114k median household income63301633046330363301: $85k median household income63303: $99k median household income63304: $114k median household income63301633046330363301: $85k median household income63303: $99k median household income63304: $114k median household income633016330463303
The 3 residential ZIP codes named Saint Charles, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are Saint Charles's ZIP codes?

The highest median household income is in 63304 ($114,442), the lowest in 63301 ($85,308). Home values run from $267,600 in 63301 to $351,000 in 63304.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 3 residential ZIP codes of Saint Charles

Residential ZIP codes with the postal name Saint Charles, MO, largest first (ACS 2020-2024); sort by any column
County
63301 St. Charles County 52,667 625 $85k $268k
63303 St. Charles County 46,089 2,333 $99k $321k
63304 St. Charles County 43,195 784 $114k $351k

Download the 4 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in Saint Charles

1 ZIP code named Saint Charles has no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

Saint Charles, MO: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
63302St. Charles County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do Saint Charles's ZIP codes reach?

Saint Charles's residential ZIP codes lie in St. Charles County.

Which places do Saint Charles's ZIP codes cover?

A postal name is not a city limit. By the Census Bureau's places, Saint Charles's residential ZIP codes cover 4 other places, each listed with the ZIP codes that have at least 5% of their land in it or hold most of the place:

Source: U.S. Census Bureau, 2020 ZCTA-to-place relationship file (shares of land).

Which first three digits do Saint Charles's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Saint Charles starts with 633.

Three-digit prefixes of Saint Charles's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Saint Charles's
PrefixSectional centerHereAll codes
633 St Louis, MO (SCF 630) 4 51

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.