PlainZIP

Saint Louis, MO · standard

ZIP Code 63121

St. Louis County, Missouri - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

26,602
1,431/sq mi
$42,701
Median income
$95,600
Median home value
24.2%
Bachelor's or higher

The verdict

Saint Louis pairs one of the lowest household incomes in the country with among the most affordable home values nationally, in a low-density, mixed-tenure area.

7th pct
household income, US ZIPs
8th pct
home value, US ZIPs
1,431
people per sq mi
52%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 63121 against every reporting US ZIP.

ZIP code 63121 is a densely settled ZIP (a standard USPS delivery area) in Saint Louis, St. Louis County, Missouri, with 26,602 residents across 18.6 square miles, a density of 1,431 people per square mile, in the Chicago time zone.

ZIP 63121 reports a modest median household income of $42,701 (36% below the Missouri average), while per-capita income is $27,628. 25.6% of residents live below the poverty line, and the unemployment rate reads 12.3%. The typical home here is valued at $95,600 (50% below the state average); renters pay a median of $985 monthly, and 51.6% of units are owner-occupied.

Educational attainment sits below the national norm: 24.2% of adults hold a bachelor's degree or higher, the median age is 33.2, and the average commute is 24 minutes. To put 63121 in local context, 10 ZIP codes within roughly 10 miles appear further down this page alongside 6 additional ZIPs in St. Louis County, for a geography-aware comparison.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 63121

Top 5 sectors by establishment count in Saint Louis, MO

Which industries have the most business establishments in ZIP 63121.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 63121, Saint Louis, MO · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

26,602

Population

18.6

Area (sq mi)

1,431

People / sq mi

Chicago

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 63121?

33.2

Median Age

44.0%

Male

56.0%

Female

3.2%

Foreign-Born

White 14.3%
African American 78.8%
Asian 2.0%
American Indian or Alaska Native 0.2%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 3.3%
Hispanic or Latino 2.5%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$42,701

Median Household Income

-36% vs state

$27,628

Per Capita Income

25.6%

Poverty Rate

12.3%

Unemployment Rate

23.8 min

Mean Commute Time

How ZIP 63121 ranks nationally

Saint Louis, MO household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$42,701 7th percentile higher than 7% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). This entry sits in this band. $60,000–$80,000: 9,980 US ZIPs (33%). Above this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Above this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Above this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Above this entry. $140,000–$160,000: 686 US ZIPs (2%). Above this entry. $160,000–$180,000: 364 US ZIPs (1%). Above this entry. $180,000–$200,000: 186 US ZIPs (1%). Above this entry. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 60.1%
Bachelor's Degree or Higher 24.2%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

13,008

Total Housing Units

11,142

Occupied Units

1,866

Vacant Units

2.15

Avg Household Size

Occupancy Type

Owner 51.6%
Renter 48.4%

$95,600

Median Home Value

-50% vs state

$985

Median Rent

1953

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

+7.7%

YoY Change (2024)

180

HPI Index (2000 = 100)

+80%

Total Change Since 2000

Home values in ZIP 63121 have increased 7.7% over the past year (2024). Since 2000, this ZIP has seen +80% cumulative appreciation.

Year Annual Change HPI Index
2020 +9.0% 123
2021 +10.4% 135
2022 +18.4% 160
2023 +4.6% 168
2024 +7.7% 180

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 315 business establishments in ZIP 63121, employing approximately 4,540 people with a combined annual payroll of $364,428,000.

315

Businesses

4,540

Employees

$364.4M

Annual Payroll

15

Industry Sectors

Industry Establishments % of Total
Health care and social assistance 112 35.6%
Retail trade 43 13.7%
Other services (except public administration) 29 9.2%
Accommodation and food services 26 8.3%
Finance and insurance 24 7.6%
Construction 14 4.4%
Administrative and support and waste management and remediation services 14 4.4%
Professional, scientific, and technical services 13 4.1%
Transportation and warehousing 7 2.2%
Real estate and rental and leasing 7 2.2%
Wholesale trade 6 1.9%
Management of companies and enterprises 6 1.9%
Educational services 5 1.6%
Arts, entertainment, and recreation 5 1.6%
Manufacturing 4 1.3%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 63121 vs 63133 →

ZIP 63121 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 63121 ranks #4 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 63121 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 63121 ranks #7 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
63133 Saint Louis, MO 8,161 1.8 mi
63135 Saint Louis, MO 21,334 3.0 mi
63140 Saint Louis, MO 294 2.5 mi
63120 Saint Louis, MO 10,296 2.4 mi
63130 Saint Louis, MO 30,084 3.2 mi
63114 Saint Louis, MO 36,201 3.3 mi
63112 Saint Louis, MO 20,368 3.5 mi
63136 Saint Louis, MO 48,560 3.4 mi
63134 Saint Louis, MO 13,638 3.5 mi
63115 Saint Louis, MO 20,775 3.7 mi

More ZIP Codes in St. Louis County

63021 standard
Ballwin, MO
Pop: 56,261
63129 standard
Saint Louis, MO
Pop: 52,718
63123 standard
Saint Louis, MO
Pop: 49,308
63136 standard
Saint Louis, MO
Pop: 48,560
63031 standard
Florissant, MO
Pop: 48,212
63026 standard
Fenton, MO
Pop: 44,124

Related Areas

St. Louis County Saint Louis, MO Missouri

Frequently Asked Questions

What county is ZIP code 63121 in? ▼
ZIP code 63121 (Saint Louis) is located in St. Louis County, Missouri. St. Louis County contains multiple ZIP codes, see the full list at /counties/st-louis-mo-29189.
What is the population of ZIP code 63121? ▼
ZIP code 63121 in Saint Louis, MO has a population of 26,602 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 63121? ▼
The median household income in ZIP 63121 is $42,701, which is 44% below the national average of $76,288.
What is the average home value in ZIP 63121? ▼
The median home value in ZIP 63121 is $95,600, which is 66% below the national average of $278,155.
What is the demographic makeup of ZIP 63121? ▼
The largest racial group in ZIP 63121 is African American at 78.8%. Hispanic or Latino residents make up 2.5% of the population.
How many businesses are in ZIP code 63121? ▼
ZIP code 63121 has 315 business establishments employing approximately 4,540 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 63121? ▼
The top industries by establishment count in ZIP 63121 are: Health care and social assistance (112), Retail trade (43), Other services (except public administration) (29). There are 15 industry sectors represented in total.
How have home values changed in ZIP code 63121? ▼
According to the FHFA House Price Index, home values in ZIP 63121 increased by 7.7% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 80%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 63121? ▼
In ZIP code 63121, 60.1% of residents aged 25+ have a high school diploma or higher, and 24.2% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 63121? ▼
The mean commute time for workers in ZIP code 63121 is 23.8 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 63121? ▼
In ZIP code 63121, approximately 51.6% of occupied housing units are owner-occupied and 48.4% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 63121? ▼
The poverty rate in ZIP code 63121 is 25.6% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.