St. Louis County, MO Population

Overview

1.00 million

Total Population

40.3

Median age

52.23%

Female population %

91.5:100

Gender ratio (M:F)

60-64 years

Largest age group

57.0

Total dependency ratio

White

Largest racial group

30,266

Hispanic population

Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

TABLE OF CONTENTS

Age

St. Louis County's population is old compared to the rest of the country:

The median age in St. Louis County is 40.3, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
St. Louis County's population under 18 was 22.24%, compared to the 22.51% nationwide.
St. Louis County's elderly or the senior population (over 65 age) was 18.03% as compared to 16.04% nationwide.
Of the total population in St. Louis County, 18.28% were under the age of 15, 18.69% aged 15 to 29, 45.00% aged 30 to 64, 15.55% aged 65 to 84, and 2.49% were 85 years of age and older.

There are 44,746 more females than males in St. Louis County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 52.23% females and 47.77% males in St. Louis County, MO.
The St. Louis County, MO gender ratio is 91.5:100 i.e. 91.5 men to 100 women (0.915).
For male population, the largest age group is 55-59 years with a population of 33,522.
For the female population, the largest age group is 60-64 years with a population of 37,423.

St. Louis County's population has become increasingly diverse:

Racial distribution of St. Louis County population: 65.25% are White, 24.18% are Black or African American, 0.11% are American Indian and Alaska Native, 4.55% are Asian, 0.02% are Native Hawaiian and other Pacific Islander, 1.23% are some other race and 4.67% are multiracial.
St. Louis County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 30,266 is Hispanic or Latino (of any race), and 971,716 (96.98% of the total population) is Non-Hispanic.
The largest racial group in St. Louis County is White with a population of 653,837 (65.25% of the total population).

St. Louis County's population has already reached its peak and is showing a trend of decline:

The peak population was 1,016,451 in the year 2001
From 2000 to 2010, St. Louis County's population decreased by 17,429 (1.71%), as compared to the national growth of 9.63%.
From 2010 to 2020, St. Louis County's population increased by 4,210 (0.42%), according to Census Bureau's Population Estimates Program. For the same period, the rate of growth for the United States was 7.17%.
Between the year 2000 and 2022, St. Louis County's population was lowest in year 2022 at 990,414.