St. Louis County Population

1860–2026

200.41K

2026 projection

0.2% since 2020 (increase)

050K100K150K200K250K186018801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for St. Louis County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026200,406-1120.06%
2025200,518-1120.06%
2024200,630-390.02%
2023200,669+1020.05%
2022200,567+1,2270.62%
2021199,340-7270.36%
2020200,067+8550.43%
2019199,212-6380.32%
2018199,850-220.01%
2017199,872-1510.08%

Showing 10 of 31 years.

St. Louis County Demographics

41.2median age

Median age

Female42.1 yrs
Male40.5 yrs

Adults

162,993
42,751 seniors (65+) · 26% of adults120,242 other adults

Sex

Female 49.7% · 99,380Male 50.3% · 100,743

Population by age

MaleFemale85+ years, male: 1,69085+ years, female: 3,24080–84 years, male: 2,17180–84 years, female: 2,49075–79 years, male: 3,36675–79 years, female: 3,89970–74 years, male: 5,74770–74 years, female: 6,09865–69 years, male: 7,21165–69 years, female: 6,83960–64 years, male: 7,60260–64 years, female: 7,44355–59 years, male: 5,85455–59 years, female: 6,17450–54 years, male: 5,78050–54 years, female: 5,32345–49 years, male: 5,48145–49 years, female: 5,15440–44 years, male: 6,19240–44 years, female: 5,41535–39 years, male: 6,31435–39 years, female: 6,00530–34 years, male: 6,00830–34 years, female: 5,42825–29 years, male: 5,87625–29 years, female: 5,62420–24 years, male: 8,86620–24 years, female: 8,86715–19 years, male: 7,10015–19 years, female: 6,59010–14 years, male: 5,63910–14 years, female: 5,0235–9 years, male: 5,0895–9 years, female: 5,2230–4 years, male: 4,7570–4 years, female: 4,54585+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–42K2K4K4K6K6K8K8K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 2,001 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

St. Louis County Income

$70,069median household income

Median household income

$70,069

Half of households earn more, half earn less

Median earnings

$51,021

Typical yearly pay for a worker 25 or older.

Poverty rate

13.2%

About 1 in 8 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

St. Louis County Marital Status

46% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married46%46%47%
Never married35%39%31%
Divorced12%11%12%
Widowed6%3%9%
Separated1%1%<1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year