St. Charles County, MO Population

Overview

402,377

Total Population

39.2

Median age

50.57%

Female population %

97.7:100

Gender ratio (M:F)

55-59 years

Largest age group

52.6

Total dependency ratio

White

Largest racial group

13,93

Hispanic population

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

TABLE OF CONTENTS

Age

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

The median age in St. Charles County is 39.2, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
St. Charles County's population under 18 was 23.30%, compared to the 22.51% nationwide.
St. Charles County's elderly or the senior population (over 65 age) was 15.34% as compared to 16.04% nationwide.
Of the total population in St. Charles County, 19.12% were under the age of 15, 18.45% aged 15 to 29, 47.09% aged 30 to 64, 13.74% aged 65 to 84, and 1.60% were 85 years of age and older.

There are 4,605 more females than males in St. Charles County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 50.57% females and 49.43% males in St. Charles County, MO.
The St. Charles County, MO gender ratio is 97.7:100 i.e. 97.7 men to 100 women (0.977).
For male population, the largest age group is 35-39 years with a population of 14,676.
For the female population, the largest age group is 55-59 years with a population of 14,658.

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

Racial distribution of St. Charles County population: 87.70% are White, 4.62% are Black or African American, 0.08% are American Indian and Alaska Native, 2.69% are Asian, 0.03% are Native Hawaiian and other Pacific Islander, 0.86% are some other race and 4.02% are multiracial.
St. Charles County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 13,93 is Hispanic or Latino (of any race), and 388,447 (96.54% of the total population) is Non-Hispanic.
The largest racial group in St. Charles County is White with a population of 352,89 (87.70% of the total population).

St. Charles County's population has not reached its peak yet and is showing a trend of further growth:

The peak population was 413,803 in the year 2022
From 2000 to 2010, St. Charles County's population increased by 75,572 (26.40%), as compared to the national growth of 9.63%.
From 2010 to 2020, St. Charles County's population increased by 44,577 (12.32%), 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. Charles County's population was lowest in year 2000 at 286,236.