Residential delivery area · Missouri
ZIP Code 63021: Ballwin, MO
ZIP code 63021 uses the postal name Ballwin, Missouri and lies entirely in St. Louis County (Census 2020 ZIP-county file). About 56,000 people live there (Census Bureau, ACS 2020-2024), the more populous of Ballwin's 2 residential ZIP codes. Median household income is $120,177 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Ballwin (17%), Manchester (16%), Wildwood (15%), Ellisville (9%), Twin Oaks (1%) and Winchester (1%), and under 1% in smaller places; 40% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Ballwin · 2 residential ZIPs
- County
- St. Louis County
- Census places
- Ballwin (17%); Manchester (16%); Wildwood (15%); Ellisville (9%)
- Metro area
- St. Louis, MO-IL
- House district
- MO-2 119th Congress
- State
- Missouri
- Time zone
- Central
- Land area
- 21.8 sq mi · 2,551 people per sq mi
Where is ZIP code 63021?
63021 centers on 38.570°, -90.546° and covers 21.8 square miles of land plus 0.2 of water. It borders 7 ZIP codes: 63011, 63088, 63040, 63038, 63131, 63025, 63122.
The map draws ZIP code areas only. For the streets inside 63021, 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 63021 compare with the rest of Ballwin?
| Measure | 63021 | In Ballwin | In St. Louis County | In MO |
|---|---|---|---|---|
| People (ACS 2020-2024) | 55,666 | 1st of 2 | 1st of 47 | 4th of 1,035 |
| Median household income | $120k | 2nd of 2 | 12th of 44 | 22nd of 479 |
| Median home value | $350k | 2nd of 2 | 15th of 45 | 47th of 494 |
Its median household income is higher than in 90% of U.S. residential ZIP codes, and it is denser than 87% 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 63021?
The 2020 Census counted 56,680 people in 63021; the ACS, which samples households over 2020-2024, estimates 55,666. Between the 2010 and 2020 censuses its population grew 0.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 55,666
- 2020 Census count
- 56,680+0.7% since 2010 (56,261)
- Households
- 22,131
- Median age
- 40.7
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 63021?
Of the 55,666 people the ACS estimates in 63021, 22.2% are under 18 and 18.0% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (75.3%), then Asian (not Hispanic) (10.3%).
- Under 1822.2%
- 18 to 6459.7%
- 65 and older18.0%
- White, not Hispanic75.3%
- Asian, not Hispanic10.3%
- Other or two or more6.3%
- Hispanic or Latino5.6%
- Black, not Hispanic2.5%
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 63021 earn?
Median household income is $120,177 (ACS 2020-2024), the 12th highest of the 44 ranked ZIP codes in St. Louis County. It rose from $110,943 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $120,177
- Income per person
- $56,249
- Below the poverty line
- 5.4%
- Unemployed (of the labor force)
- 4.1%
- Adults 25+ with a bachelor's degree
- 63.0%
- Adjusted gross income per tax return, 2022
- $108,84728,140 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 63021?
FHFA's house price index for 63021, built from repeat sales and appraisals of the same homes, rose 76% from 2015 to 2025 and rose 44% from 2020 to 2025, and moved +3.6% in 2025.
- Median home value (owners' estimate)
- $349,500
- Median gross rent
- $1,423
- Homes owned by their occupants
- 80.7%
- Housing units
- 22,942
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 63021?
725 business establishments had a location in this ZIP code in 2023, 25 fewer than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services132
- Health care and social assistance93
- Construction75
- Administrative and support and waste management and remediation services64
- Other services (except public administration)54
- Finance and insurance48
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 63021?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 63011 | Ballwin | 35,920 | $125k | 2.5 mi |
| 63088 | Valley Park | 8,226 | $66k | 2.8 mi |
| 63040 | Wildwood | 8,526 | $133k | 4.8 mi |
| 63038 | Wildwood | 7,107 | $187k | 6.6 mi |
| 63131 | Saint Louis | 17,935 | $226k | 6.6 mi |
| 63025 | Eureka | 19,508 | $126k | 6.6 mi |
| 63122 | Saint Louis | 41,634 | $136k | 6.8 mi |
| 63017 | Chesterfield | 43,243 | $127k | 6.0 mi (near) |
| 63049 | High Ridge | 16,592 | $92k | 6.4 mi (near) |
| 63026 | Fenton | 45,354 | $98k | 6.6 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.