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Residential delivery area · Missouri

ZIP Code 63121: Saint Louis, MO

ZIP code 63121 uses the postal name Saint Louis, Missouri and lies entirely in St. Louis County (Census 2020 ZIP-county file). About 25,000 people live there (Census Bureau, ACS 2020-2024), the 14th most populous of Saint Louis's 46 residential ZIP codes. Median household income is $42,701 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Normandy (22%), Northwoods (10%), Bel-Ridge (9%), Cool Valley (7%), Pine Lawn (7%), Bel-Nor (7%), Jennings (5%), Bellerive Acres (5%), Hillsdale (4%), Pasadena Hills (3%), Greendale (3%), Velda City (2%), Norwood Court (2%), Velda Village Hills (2%), Pasadena Park (1%), Beverly Hills (1%), Uplands Park (1%) and Glen Echo Park (under 1%), and 2% in smaller places; 6% is outside any Census place.

  • ACS2020-24
  • Census2020
  • FHFA2025
  • ZBP2023
  • IRS2022
6national area: Missouri, Illinois, Kansas and Nebraska
631sectional center: St Louis, MO (SCF 630)
21delivery area within it
Town
Saint Louis · 46 residential ZIPs
Census places
Normandy (22%); Northwoods (10%); Bel-Ridge (9%); Cool Valley (7%)
Metro area
St. Louis, MO-IL
House district
MO-1 119th Congress
Time zone
Central
Land area
6.8 sq mi · 3,693 people per sq mi
PO Box ZIPs
22 more ZIP codes use the name Saint Louis for PO boxes or single organizations

Where is ZIP code 63121?

63121 centers on 38.708°, -90.301° and covers 6.8 square miles of land plus 0.0 of water. It borders 6 ZIP codes: 63133, 63120, 63135, 63134, 63136, 63114.

63114 · Saint Louis63120 · Saint Louis63133 · Saint Louis63134 · Saint Louis63135 · Saint Louis63136 · Saint Louis63121 · Saint Louis (this ZIP)6312163136631146313463135631336312063114 · Saint Louis63120 · Saint Louis63133 · Saint Louis63134 · Saint Louis63135 · Saint Louis63136 · Saint Louis63121 · Saint Louis (this ZIP)6312163136631146313463135631336312063114 · Saint Louis63120 · Saint Louis63133 · Saint Louis63134 · Saint Louis63135 · Saint Louis63136 · Saint Louis63121 · Saint Louis (this ZIP)63121631366311463134631356313363120
Shaded by median household income, in national fifths (ACS 2020-2024); 63121 outlined. Census 2020 ZCTA boundaries. <$54.1k$98.1k+no figure

The map draws ZIP code areas only. For the streets inside 63121, 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 63121 compare with the rest of Saint Louis?

Rank of 63121 among the residential ZIP codes of its town, county and state (1 = the most; income and home value among ZIP codes of 1,000+ people living in households)
Measure63121In Saint LouisIn St. Louis CountyIn MO
People (ACS 2020-2024)25,00814th of 4617th of 4771st of 1,035
Median household income$43k33rd of 3842nd of 44458th of 479
Median home value$96k33rd of 4240th of 45466th of 494

Its median household income is higher than in 7% of U.S. residential ZIP codes, and it is denser than 91% 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 63121?

The 2020 Census counted 22,909 people in 63121; the ACS, which samples households over 2020-2024, estimates 25,008. Between the 2010 and 2020 censuses its population fell 13.9% (its boundary stayed at least 90% the same).

People, ACS 2020-2024
25,008
2020 Census count
22,909−13.9% since 2010 (26,602)
Households
11,142
Median age
33.2

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 63121?

Of the 25,008 people the ACS estimates in 63121, 21.4% are under 18 and 16.9% are 65 or older. The largest group by race and Hispanic origin is Black (not Hispanic) (78.6%), then White (not Hispanic) (13.9%).

  • Under 1821.4%
  • 18 to 6461.7%
  • 65 and older16.9%
Age of the people of 63121 (ACS 2020-2024, B01001)
  • Black, not Hispanic78.6%
  • White, not Hispanic13.9%
  • Other or two or more3.0%
  • Hispanic or Latino2.5%
  • Asian, not Hispanic2.0%
Race and Hispanic origin in 63121 (ACS 2020-2024, B03002); each person counted once

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 63121 earn?

Median household income is $42,701 (ACS 2020-2024), the 42nd highest of the 44 ranked ZIP codes in St. Louis County. It fell from $48,066 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.

Median household income
$42,701
Income per person
$27,628
Below the poverty line
25.6%
Unemployed (of the labor force)
12.3%
Adults 25+ with a bachelor's degree
24.2%
Adjusted gross income per tax return, 2022
$41,08410,310 returns; wages 75% 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 63121?

FHFA's house price index for 63121, built from repeat sales and appraisals of the same homes, rose 83% from 2015 to 2025 and rose 50% from 2020 to 2025, and moved −0.0% in 2025.

Median home value (owners' estimate)
$95,600
Median gross rent
$985
Homes owned by their occupants
51.6%
Housing units
13,008
0 100 200 300 400 197719902000201020202025 0 100 200 300 400 197719902000201020202025 0 100 200 300 400 197719902000201020202025
Index = 100 in 1977, the first year FHFA reports for 63121; 2025: 455.4. Annual, not seasonally adjusted; FHFA calls its ZIP-level indexes developmental.

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 63121?

315 business establishments had a location in this ZIP code in 2023, 118 fewer than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).

  • Health care and social assistance112
  • Retail trade43
  • Other services (except public administration)29
  • Accommodation and food services26
  • Finance and insurance24
  • Construction14

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 63121?

ZIP codes that share a boundary with 63121, then the nearest by center
ZIPTownPeopleHousehold incomeDistance
63133Saint Louis6,569$39k1.8 mi
63120Saint Louis6,790$35k2.4 mi
63135Saint Louis18,381$52k3.0 mi
63134Saint Louis13,059$45k3.3 mi
63136Saint Louis40,929$41k3.4 mi
63114Saint Louis33,969$56k3.4 mi
63140Saint Louis316$46k2.5 mi (near)
63130Saint Louis28,910$86k3.3 mi (near)

Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.