St. Louis County, MO demographics:
population, income, and more

Total population
995,569
-0.1% year-over-year change
Median household income
$82,936/yr
2.0% year-over-year change
Housing units
446,192
0.2% year-over-year change

St. Louis County population

How many people live in St. Louis County

St. Louis County is home to 995,569 residents, according to the most recent Census data. Gender-wise, 47.8% of St. Louis County locals are male, and 52.2% are female.

Total population
995,569
-0.1% year-over-year change
Gender ratio
Male
47.8%
476,263
Female
52.2%
519,306
Value Percent YoY change
Male 476,263 47.8% -0.1%
Female 519,306 52.2% -0.1%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in St. Louis County is 40, with the population distributed as follows: about 18% are children under 15, then 12.4% are in the 15 to 24 age group. Adults between 25 and 44 make up 25.6% of the population, while another 25% fall into the 45 to 64 bracket. Finally, around 19.1% are 65 or older.

Median age
40.3
Age breakdown
Under 15
18%
15 to 24
12.4%
25 to 44
25.6%
45 to 64
25%
Over 65
19.1%
Value Percent YoY change
Under 15 179,417 18% -0.9%
15 to 24 122,978 12.4% -0.1%
25 to 44 254,329 25.6% 0.4%
45 to 64 248,526 25% -1.8%
Over 65 190,319 19.1% 2.2%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In St. Louis County, 90.9% of the population are US-born citizens, while 5.4% have gained naturalized citizenship. At the same time, 3.8% of residents are non-citizens. As for race, 62.1% of locals are Caucasian, 24.1% are African American and 4.9% have Asian roots. There’s also a share of 7% that includes residents with two or more races.

Citizenship
U.S.-born citizens
90.9%
Non-U.S.-born citizens
5.4%
Non-citizens
3.8%
Value Percent YoY change
U.S.-born citizens 904,676 90.9% -0.3%
Non-U.S.-born citizens 53,262 5.4% -1.7%
Non-citizens 37,631 3.8% 6.6%
Racial breakdown
White
62.1%
Black or African American
24.1%
American Indian and Alaska Native
0.1%
Asian
4.9%
Native Hawaiian and other Pacific Islander
0%
Two or more races
7%
Other
1.8%
Value Percent
White 618,307 62.1%
Black or African American 240,070 24.1%
American Indian and Alaska Native 1,148 0.1%
Asian 48,760 4.9%
Native Hawaiian and other Pacific Islander 213 0%
Two or more races 69,258 7%
Other 17,813 1.8%

Households in St. Louis County

A peek inside St. Louis County households

St. Louis County has 413,849 households, with an average of 2 members in each. Of these, 61.7% are families, while the remaining 38.3% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
413,849
-0.2% year-over-year change
Average people per household
2
Non-family households
158,438
Family households
255,411
Value Percent YoY change
Non-family households 158,438 38.3% 0.8%
Family households 255,411 61.7% -0.8%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in St. Louis County

The housing landscape of St. Louis County

St. Louis County's housing consists of 446,192 units, with 72% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 4.6% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 0.4% of the housing landscape.

Housing units
446,192
0.2% year-over-year change
Housing types
Value Percent
1 unit, detached 321,187 72%
1 unit, attached 20,308 4.6%
2 units 6,883 1.5%
3 or 4 units 22,012 4.9%
5 to 9 units 24,958 5.6%
10 to 19 units 20,950 4.7%
20 to 49 units 10,672 2.4%
50 or more units 17,485 3.9%
Mobile home 1,546 0.4%
Boat, RV, van, etc. 191 0%
Homes built since 2020
3,165
82.7% year-over-year change

The age of buildings in St. Louis County

In St. Louis County, the median construction year is 1969. About 9.7% of homes were built before the 1940s, with another 6.3% going up by 1949. Most development happened in the second half of the 20th century. Then, 6.3% of homes were added from 2000 to 2009, 3.5% between 2010 and 2019, and 0.7% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 43,354 9.7% 1.1%
Built between 1940 and 1949 28,196 6.3% -3.5%
Built between 1950 and 1959 81,063 18.2% -0.8%
Built between 1960 and 1969 82,127 18.4% -1.5%
Built between 1970 and 1979 71,197 16% 0.0%
Built between 1980 and 1989 53,584 12% 1.9%
Built between 1990 and 1999 39,817 8.9% 0.2%
Built between 2000 and 2009 27,989 6.3% 0.7%
Built between 2010 and 2019 15,700 3.5% 2.7%
Built in 2020 or later 3,165 0.7% 82.7%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

St. Louis County occupancy rates

Out of the 413,849 occupied housing units in St. Louis County, 69.2% are owner-occupied, while 30.8% are lived in by tenants. Meanwhile, 7.2% of all homes on the local market sit vacant.

Occupied housing units
413,849
-0.2% year-over-year change
Occupancy breakdown
Renter occupied
127,319
Owner occupied
286,530
Value Percent YoY
change
Renter occupied 127,319 30.8% -0.8%
Owner occupied 286,530 69.2% 0.1%
Unoccupied housing units
7.2%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

St. Louis County housing costs

Housing costs in St. Louis County come to a median of $1,284 per month, while tenants specifically pay a median gross rent of $1,209.

Median housing costs per month
$1,284/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in St. Louis County
$1,209/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in St. Louis County

St. Louis County education at a glance

About 26.4% of the population in St. Louis County went to high school, while 19.9% pursued college studies. Another 7.5% earned an associate degree and 26.1% hold a bachelor’s. Meanwhile, 18.4% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 13,096 1.7% 3.0%
High school diploma 205,461 26.4% -0.6%
College diploma 154,424 19.9% -1.7%
Associate degree 58,498 7.5% 1.8%
Bachelor's degree 202,540 26.1% 1.3%
Graduate degree 142,646 18.4% 0.2%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in St. Louis County

How much people earn in St. Louis County

The average annual household income in St. Louis County was $123,036 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +1.6% change from the previous year. At the same time, the median income stood at $82,936, reflecting a +2% shift over the same period.

Average household income in St. Louis County
$123,036/year
1.6% year-over-year change
Median household income in St. Louis County
$82,936/year
2.0% year-over-year change

St. Louis County income by age

In St. Louis County, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $89,811. Those with someone between 45 and 64 in charge, often well established professionally, earn $103,346 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $41,379, while those led by someone over 65, many of whom may be retired, have about $63,295 in earnings. Overall, 90.3% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $41,379 5.5%
25 - 44 $89,811 4.0%
45 - 64 $103,346 1.4%
Over 65 $63,295 1.9%
Above poverty level
868,753
Below poverty level
93,594
Value Percent YoY
change
Above poverty level 868,753 90.3% -0.4%
Below poverty level 93,594 9.7% 1.9%

Employment in St. Louis County

Workforce and job types in St. Louis County

The job market in St. Louis County is powered by 498,791 working residents, spread across a range of industries and roles. 84.8% of the working population are employed in professional or administrative positions, while 15.2% are in hands-on or service-based jobs. Also, 8.7% run their own businesses, 67.7% are employed by private companies, and 10.4% work in the public sector.

Workforce demographics

Working population
498,791
-0.4% year-over-year change
White collar
422,785
Blue collar
76,006
Value Percent YoY change
White collar 422,785 84.8% -0.0%
Blue collar 76,006 15.2% -2.2%
Employer type
Self employees
8.7%
Private companies
67.7%
Governmental workers
10.4%
Not for profit companies
13.2%
Value Percent YoY change
Self employees 43,389 8.7% 0.6%
Private companies 337,482 67.7% -0.1%
Governmental workers 51,835 10.4% -0.5%
Not for profit companies 66,085 13.2% -2.0%
Unemployment rate
4.3%
2.9% year-over-year change

Available workforce

The unemployment rate in St. Louis County stands at 4.3%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in St. Louis County

How people get around in St. Louis County

In St. Louis County, the average commute time is 23 minutes. Commuting methods vary: 77.8% of residents travel by personal vehicle and 1.4% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
23 min
-0.9% year-over-year change
Means of transportation
Value Percent YoY change
Car 380,866 77.8% -3.0%
Taxicab 835 0.2% 80.7%
Bus or trolleybus 5,143 1% -7.4%
Subway or elevated 975 0.2% N/A
Railroad 356 0.1% 62.6%
Ferryboat 22 0% 4.8%
Motorcycle 386 0.1% -19.4%
Bicycle 893 0.2% 22.7%
Walk 6,745 1.4% 4.2%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in St. Louis County by zipcode?

Zipcode Population Number of households Median income Average income
63005 19,779 7,134 $198,469 $270,772
63011 35,920 14,437 $124,454 $145,652
63017 43,243 17,957 $127,095 $177,913
63021 55,666 22,131 $120,177 $140,278
63025 19,508 6,911 $125,676 $145,093
63026 45,354 17,488 $97,553 $119,725
63031 50,196 19,408 $70,811 $86,951
63033 43,056 17,660 $66,776 $80,248
63034 18,908 6,670 $103,905 $116,695
63038 7,107 2,499 $186,450 $224,901

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FAQs about St. Louis County demographics 

What is the total population of St. Louis County?

St. Louis County has a total population of 995,569 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -0.1% compared to a year ago.

What is the gender ratio in St. Louis County?

The gender ratio in St. Louis County is as follows:
  • 47.8% males (476,263 residents)
  • 52.2% females (519,306 residents)

What is the median age in St. Louis County?

The median age in St. Louis County is 40.3.

What is the age distribution of the population in St. Louis County?

The age distribution in St. Louis County is as follows:
  • Under 15: 18% (179,417 residents)
  • Ages 15-24: 12.4% (122,978 residents)
  • Ages 25-44: 25.6% (254,329 residents)
  • Ages 45-64: 25% (248,526 residents)
  • Over 65: 19.1% (190,319 residents)

What is the racial and ethnic makeup of St. Louis County?

The racial and ethnic makeup of St. Louis County is as follows:
  • White: 62.1% (618,307 residents)
  • Black or African American: 24.1% (240,070 residents)
  • American Indian and Alaska Native: 0.1% (1,148 residents)
  • Asian: 4.9% (48,760 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (213 residents)
  • Two or More Races: 7% (69,258 residents)
  • Other: 1.8% (17,813 residents)

What percentage of the population in St. Louis County are U.S.-born citizens?

U.S.-born citizens represent 90.9% of the population in St. Louis County.

How many housing units are there in St. Louis County?

There are 446,192 housing units in St. Louis County, reflecting a +0.2% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in St. Louis County and what is the average household size?

St. Louis County has a total of 413,849 households, with an average of 2 people in each.

What is the median household income in St. Louis County?

St. Louis County has a median household income of $82,936, representing a +2.0% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for St. Louis County?

The employment rate is 95.7% in St. Louis County, with a workforce of 498,791 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 84.8% (422,785 residents)
  • Blue-collar workers: 15.2% (76,006 residents)

Places of employment:
  • Self-employed: 8.7% (43,389 residents)
  • Private companies: 67.7% (337,482 residents)
  • Governmental workers: 10.4% (51,835 residents)
  • Not-for-profit companies: 13.2% (66,085 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025