Residential delivery area · Missouri
ZIP Code 63303: Saint Charles, MO
ZIP code 63303 uses the postal name Saint Charles, Missouri and lies entirely in St. Charles County (Census 2020 ZIP-county file). About 46,000 people live there (Census Bureau, ACS 2020-2024), the 2nd most populous of Saint Charles's 3 residential ZIP codes. Median household income is $99,138 (Census Bureau, ACS 2020-2024). By Census place, 37% of its land lies in St. Charles, and 4% in smaller places; 60% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Saint Charles · 3 residential ZIPs
- County
- St. Charles County
- Census places
- St. Charles
- Metro area
- St. Louis, MO-IL
- House district
- MO-3 119th Congress
- State
- Missouri
- Time zone
- Central
- Land area
- 19.8 sq mi · 2,333 people per sq mi
- PO Box ZIPs
- 63302 also use the name Saint Charles
Where is ZIP code 63303?
63303 centers on 38.740°, -90.544° and covers 19.8 square miles of land plus 1.5 of water. It borders 6 ZIP codes: 63146, 63043, 63376, 63017, 63304, 63301.
The map draws ZIP code areas only. For the streets inside 63303, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 63303 compare with the rest of Saint Charles?
| Measure | 63303 | In Saint Charles | In St. Charles County | In MO |
|---|---|---|---|---|
| People (ACS 2020-2024) | 46,089 | 2nd of 3 | 6th of 15 | 15th of 1,035 |
| Median household income | $99k | 2nd of 3 | 8th of 11 | 48th of 479 |
| Median home value | $321k | 2nd of 3 | 8th of 12 | 63rd of 494 |
Its median household income is higher than in 80% of U.S. residential ZIP codes, and it is denser than 86% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 63303?
The 2020 Census counted 47,292 people in 63303; the ACS, which samples households over 2020-2024, estimates 46,089. Between the 2010 and 2020 censuses its population grew 3.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 46,089
- 2020 Census count
- 47,292+3.2% since 2010 (45,834)
- Households
- 20,690
- Median age
- 41.4
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 63303?
Of the 46,089 people the ACS estimates in 63303, 17.8% are under 18 and 19.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (79.3%).
- Under 1817.8%
- 18 to 6462.9%
- 65 and older19.3%
- White, not Hispanic79.3%
- Black, not Hispanic5.6%
- Asian, not Hispanic5.3%
- Other or two or more5.0%
- Hispanic or Latino4.8%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 63303 earn?
Median household income is $99,138 (ACS 2020-2024), the 8th highest of the 11 ranked ZIP codes in St. Charles County. It is not measurably different from 2015-2019 ($97,709 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $99,138
- Income per person
- $58,928
- Below the poverty line
- 5.3%
- Unemployed (of the labor force)
- 2.1%
- Adults 25+ with a bachelor's degree
- 48.8%
- Adjusted gross income per tax return, 2022
- $93,46423,940 returns; wages 70% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 63303?
FHFA's house price index for 63303, built from repeat sales and appraisals of the same homes, rose 90% from 2015 to 2025 and rose 51% from 2020 to 2025, and moved +5.4% in 2025.
- Median home value (owners' estimate)
- $321,100
- Median gross rent
- $1,374
- Homes owned by their occupants
- 74.1%
- Housing units
- 21,538
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 63303?
950 business establishments had a location in this ZIP code in 2023, 47 fewer than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance135
- Professional, scientific, and technical services116
- Construction102
- Other services (except public administration)96
- Accommodation and food services93
- Retail trade92
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 63303?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 63146 | Saint Louis | 30,678 | $85k | 4.3 mi |
| 63043 | Maryland Heights | 21,924 | $92k | 4.8 mi |
| 63376 | Saint Peters | 74,962 | $96k | 5.6 mi |
| 63017 | Chesterfield | 43,243 | $127k | 5.8 mi |
| 63304 | Saint Charles | 43,195 | $114k | 8.0 mi |
| 63301 | Saint Charles | 52,667 | $85k | 9.2 mi |
| 63045 | Earth City | 0 | – | 4.8 mi (near) |
| 63044 | Bridgeton | 10,324 | $78k | 6.5 mi (near) |
| 63141 | Saint Louis | 20,932 | $134k | 7.4 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.