Demographics of St. Louis County, Missouri

St. Louis County, Missouri had 990,911 people on July 1, 2025, by the Census Bureau’s estimate: −12,454 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

St. Louis County, in four figures

990,911
Population: July 1, 2025, Vintage 2025 estimate.; −1.2%
Change since July 2020: −12,454 people.; 40.3 ±0.2
Median age: ACS 2020–⁠2024.; $82,936 ±$1,390
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

St. Louis County, Missouri's population shrank 1.2% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of St. Louis County, Missouri's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

St. Louis County, Missouri's population shrank 1.2% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of St. Louis County, Missouri's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	1,003,365	100.0	100.0
2021	998,850	99.6	100.2
2022	991,719	98.8	100.7
2023	989,977	98.7	101.6
2024	991,666	98.8	102.5
2025	990,911	98.8	103.1

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Population of St. Louis County, Missouri on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	1,003,365	−1,183	−647	+92	−774
2021	998,850	−4,515	−1,646	+1,044	−4,442
2022	991,719	−7,131	−1,059	+2,969	−9,005
2023	989,977	−1,742	−705	+4,745	−5,746
2024	991,666	+1,689	−947	+6,608	−3,930
2025	990,911	−755	−1,316	+3,895	−3,370

Age, 2020–2024

The median age is 40.3 ±0.2: for men 38.6 ±0.2 and for women 41.9 ±0.2. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in St. Louis County by age, ACS 2020–2024
Age	People	Share	Missouri	United States
Under 5	55,672 ±23	5.6% ±<0.1	5.8% ±<0.1	5.6% ±<0.1
5 to 17	163,232 ±2,170	16.4% ±0.2	16.6% ±0.1	16.3% ±<0.1
18 to 24	83,491 ±1,867	8.4% ±0.2	9.1% ±0.1	9.1% ±<0.1
25 to 44	254,329 ±2,340	25.5% ±0.2	26.0% ±0.1	26.9% ±<0.1
45 to 64	248,526 ±2,413	25.0% ±0.2	24.6% ±0.1	24.8% ±<0.1
65 and over	190,319 ±2,728	19.1% ±0.3	17.9% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $82,936 ±$1,390, and income per person $51,977 ±$680, in 2024 dollars. The median is $70,702 ±$325 in Missouri and $80,734 ±$166 in the United States.

Households by income

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Households in St. Louis County by income, ACS 2020–2024
Household income	Households	Share	Missouri	United States
Under $25,000	50,835 ±1,995	12.3% ±0.5	15.8% ±0.2	14.6% ±<0.1
$25,000 to $49,999	71,671 ±2,422	17.3% ±0.6	19.6% ±0.2	16.7% ±<0.1
$50,000 to $74,999	66,938 ±2,161	16.2% ±0.5	17.4% ±0.2	15.5% ±<0.1
$75,000 to $99,999	50,997 ±1,887	12.3% ±0.5	13.2% ±0.2	12.6% ±<0.1
$100,000 to $149,999	71,312 ±2,420	17.2% ±0.6	17.1% ±0.2	17.5% ±<0.1
$150,000 to $199,999	38,121 ±1,532	9.2% ±0.4	8.2% ±0.1	9.6% ±<0.1
$200,000 or more	63,975 ±1,803	15.5% ±0.4	8.7% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in St. Louis County by age, ACS 2020–2024
Age	Below poverty	Rate	Missouri	United States
All ages	95,259 ±4,455	9.8% ±0.5	12.6% ±0.2	12.5% ±0.1
Under 18	28,795 ±1,991	13.5% ±0.9	15.8% ±0.4	16.1% ±0.1
18 to 59	45,682 ±2,675	9.0% ±0.5	12.0% ±0.2	11.6% ±0.1
60 and over	20,782 ±1,311	8.3% ±0.5	10.9% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in St. Louis County, ACS 2020–2024
Measure	St. Louis County	Missouri	United States
Housing units	446,192 ±189	2,825,287 ±1,043	143,775,355 ±10,234
Occupied	92.8% ±0.4	88.8% ±0.2	89.9% ±0.1
Vacant	7.2% ±0.4	11.2% ±0.2	10.1% ±0.1
Owner occupied	69.2% ±0.5	68.1% ±0.3	65.2% ±0.3
Renter occupied	30.8% ±0.6	31.9% ±0.2	34.8% ±0.1
Median home value	$276,800 ±$2,745	$230,300 ±$880	$332,700 ±$236
Median gross rent	$1,209 ±$12	$1,033 ±$6	$1,413 ±$2
Median year built	1969 ±1	1978 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in St. Louis County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Missouri	United States
Hispanic or Latino	38,412 ±0	3.9% ±<0.1	5.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	610,928 ±2,576	61.4% ±0.3	76.3% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	239,132 ±1,879	24.0% ±0.2	10.9% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	48,640 ±1,050	4.9% ±0.1	2.1% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	530 ±147	0.1% ±<0.1	0.2% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	184 ±80	< 0.1% ±<0.1	0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	4,838 ±884	0.5% ±0.1	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	52,905 ±3,503	5.3% ±0.4	4.8% ±0.1	4.3% ±<0.1

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in St. Louis County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Missouri	United States
Born in the state	666,943 ±5,248	67.0% ±0.5	65.6% ±0.2	57.3% ±<0.1
Born in another state	237,733 ±4,315	23.9% ±0.4	29.1% ±0.1	26.9% ±<0.1
Born a citizen outside the states	7,750 ±820	0.8% ±0.1	0.8% ±<0.1	1.7% ±<0.1
Born abroad	83,143 ±3,057	8.4% ±0.3	4.5% ±0.1	14.1% ±<0.1
Naturalized citizens	45,512 ±2,379	4.6% ±0.2	2.3% ±0.1	7.4% ±<0.1
Not citizens	37,631 ±2,348	3.8% ±0.2	2.2% ±0.1	6.8% ±<0.1

St. Louis County among the counties of Missouri

1st of 115 by population, July 2025. Every one is listed on the Missouri page.

Counties of Missouri near St. Louis County in population, July 2025
County	July 2025	Change since 2020
St. Louis County	990,911	−1.2%
Jackson County	732,994	+2.1%
St. Charles County	426,499	+4.9%
Greene County	309,286	+3.3%
St. Louis city	278,144	−7.4%
Clay County	265,032	+4.3%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026