Plain

Residential delivery area · Missouri

ZIP Code 63123: Saint Louis, MO

ZIP code 63123 uses the postal name Saint Louis, Missouri and lies mostly in St. Louis County (95% of its land) with the rest in St. Louis city (Census 2020 ZIP-county file). About 49,000 people live there (Census Bureau, ACS 2020-2024), the 2nd most populous of Saint Louis's 46 residential ZIP codes. Median household income is $77,055 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Affton (37%), Green Park (11%), Concord (10%), Grantwood Village (7%), St. George (2%), Lakeshire (2%), Marlborough (1%) and Wilbur Park (under 1%), and 11% in smaller places; 20% 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)
23delivery area within it
Town
Saint Louis · 46 residential ZIPs
Census places
Affton (37%) census-designated place; Green Park (11%); Concord (10%) census-designated place; Grantwood Village (7%)
Metro area
St. Louis, MO-IL
House districts
MO-2 (95%), MO-1 (5%) 119th Congress, by share of land
Time zone
Central
Land area
12.5 sq mi · 3,941 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 63123?

63123 centers on 38.547°, -90.328° and covers 12.5 square miles of land plus 0.1 of water. It borders 7 ZIP codes: 63125, 63126, 63109, 63119, 63116, 63111, 63128.

63109 · Saint Louis63111 · Saint Louis63116 · Saint Louis63119 · Saint Louis63125 · Saint Louis63126 · Saint Louis63128 · Saint Louis63123 · Saint Louis (this ZIP)631236312863125631196311663111631266310963109 · Saint Louis63111 · Saint Louis63116 · Saint Louis63119 · Saint Louis63125 · Saint Louis63126 · Saint Louis63128 · Saint Louis63123 · Saint Louis (this ZIP)631236312863125631196311663111631266310963109 · Saint Louis63111 · Saint Louis63116 · Saint Louis63119 · Saint Louis63125 · Saint Louis63126 · Saint Louis63128 · Saint Louis63123 · Saint Louis (this ZIP)63123631286312563119631166311163126
Shaded by median household income, in national fifths (ACS 2020-2024); 63123 outlined. Census 2020 ZCTA boundaries. <$54.1k$98.1k+no figure

The map draws ZIP code areas only. For the streets inside 63123, 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 63123 compare with the rest of Saint Louis?

Rank of 63123 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)
Measure63123In Saint LouisIn St. Louis CountyIn MO
People (ACS 2020-2024)49,0772nd of 464th of 4711th of 1,035
Median household income$77k17th of 3829th of 44155th of 479
Median home value$219k23rd of 4231st of 45197th of 494

Its median household income is higher than in 58% of U.S. residential ZIP codes, and it is denser than 92% 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 63123?

The 2020 Census counted 50,989 people in 63123; the ACS, which samples households over 2020-2024, estimates 49,077. Between the 2010 and 2020 censuses its population grew 3.4% (its boundary stayed at least 90% the same).

People, ACS 2020-2024
49,077
2020 Census count
50,989+3.4% since 2010 (49,308)
Households
21,755
Median age
40.9

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 63123?

Of the 49,077 people the ACS estimates in 63123, 18.3% are under 18 and 19.4% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (81.6%).

  • Under 1818.3%
  • 18 to 6462.3%
  • 65 and older19.4%
Age of the people of 63123 (ACS 2020-2024, B01001)
  • White, not Hispanic81.6%
  • Other or two or more5.7%
  • Asian, not Hispanic4.7%
  • Hispanic or Latino4.1%
  • Black, not Hispanic3.8%
Race and Hispanic origin in 63123 (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 63123 earn?

Median household income is $77,055 (ACS 2020-2024), the 29th highest of the 44 ranked ZIP codes in St. Louis County. It is not measurably different from 2015-2019 ($72,229 in 2024 dollars): the change is within the surveys' margins of error.

Median household income
$77,055
Income per person
$44,373
Below the poverty line
7.9%
Unemployed (of the labor force)
2.2%
Adults 25+ with a bachelor's degree
37.6%
Adjusted gross income per tax return, 2022
$69,55126,750 returns; wages 71% 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 63123?

FHFA's house price index for 63123, built from repeat sales and appraisals of the same homes, rose 80% from 2015 to 2025 and rose 46% from 2020 to 2025, and moved +3.4% in 2025.

Median home value (owners' estimate)
$219,400
Median gross rent
$1,006
Homes owned by their occupants
74.9%
Housing units
23,178
0 200 400 600 197519902000201020202025 0 200 400 600 197519902000201020202025 0 200 400 600 197519902000201020202025
Index = 100 in 1975, the first year FHFA reports for 63123; 2025: 680.6. 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 63123?

915 business establishments had a location in this ZIP code in 2023, 20 fewer than in 2018; the most are in construction (ZIP Code Business Patterns).

  • Construction115
  • Health care and social assistance107
  • Other services (except public administration)92
  • Retail trade89
  • Professional, scientific, and technical services80
  • Accommodation and food services78

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 63123?

ZIP codes that share a boundary with 63123, then the nearest by center
ZIPTownPeopleHousehold incomeDistance
63125Saint Louis33,294$62k2.7 mi
63126Saint Louis15,452$99k2.7 mi
63109Saint Louis25,236$70k3.1 mi
63119Saint Louis34,181$106k3.2 mi
63116Saint Louis42,170$61k4.1 mi
63111Saint Louis18,851$47k4.3 mi
63128Saint Louis30,540$92k5.0 mi
63143Saint Louis8,975$66k4.5 mi (near)
63139Saint Louis21,631$76k4.8 mi (near)

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