ZIP code · Saint Charles · Missouri · United States
ZIP code 63303 — Saint Charles
ZIP code 63303 serves Saint Charles, Missouri.
- Postal code
- 63303Single source Value from one source, not cross-checked.
- City
- Saint Charles
- County
- Saint Charles FIPS 29183
- State
- Missouri
- Country
- United States
- Coordinates
- 38.7622, -90.5471 — precision precise (locality)
View on OpenStreetMap - Population
- 46,627 (ZCTA, ACS 5-year)
- Population density
- 2,361 / sq mi
- Land area
- 19.8 sq mi (51.2 km²) (ZCTA, ACS 5-year)
- Median household income
- $98,031
- Per-capita income
- $57,795
- Median age
- 41.2
- Households
- 20,599
- Housing units
- 21,448
- Median home value
- $301,700
- Median gross rent
- $1,329 / month
- Congressional district
- MO-3 (119th Congress)
- USDA hardiness zone
- 7a (0 to 5 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Chicago (UTC−6 / UTC−5 DST)
- Area code
- 636Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 63303 with another ZIP · ZIPs within 25 miles · distance from 63303
Map of ZIP code 63303
Climate — monthly normals
Warmest month Jul (avg high 88°F), coldest Jan (avg low 21°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 45 | 56 | 67 | 76 | 84 | 88 | 87 | 81 | 69 | 55 | 44 |
| Avg low °F | 21 | 25 | 33 | 43 | 54 | 63 | 68 | 65 | 57 | 45 | 35 | 27 |
| Precip in | 2.4 | 2.4 | 3.5 | 4.7 | 4.8 | 4.3 | 4.2 | 3.8 | 3.1 | 3.1 | 3.5 | 2.6 |
NOAA 1991–2020 climate normals from the nearest station: ST PETERS 2 SE (2.3 mi) · NOAA NCEI
Places in ZIP 63303
- 5 schools
- 3 hospitals & clinics
- 2 doctors & dentists
- 3 supermarkets
- 33 restaurants & cafés
- 1 bars & pubs
- 7 parks
- 3 playgrounds
- 1 libraries
- 2 post offices
- 2 places of worship
- 2 banks
- 7 gas stations
- 3 EV charging stations
- 4 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page