St. Clair County, MI Population

Overview

160,067

Total Population

44.1

Median age

50.01%

Female population %

99.9:100

Gender ratio (M:F)

55-59 years

Largest age group

55.2

Total dependency ratio

White

Largest racial group

5,688

Hispanic population

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

TABLE OF CONTENTS

Age

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

The median age in St. Clair County is 44.1, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
St. Clair County's population under 18 was 20.90%, compared to the 22.51% nationwide.
St. Clair County's elderly or the senior population (over 65 age) was 18.78% as compared to 16.04% nationwide.
Of the total population in St. Clair County, 16.78% were under the age of 15, 17.63% aged 15 to 29, 46.80% aged 30 to 64, 16.67% aged 65 to 84, and 2.12% were 85 years of age and older.

There are 41 more females than males in St. Clair County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 50.01% females and 49.99% males in St. Clair County, MI.
The St. Clair County, MI gender ratio is 99.9:100 i.e. 99.9 men to 100 women (0.999).
For male population, the largest age group is 55-59 years with a population of 6,751.
For the female population, the largest age group is 55-59 years with a population of 6,603.

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

Racial distribution of St. Clair County population: 92.66% are White, 2.26% are Black or African American, 0.12% are American Indian and Alaska Native, 0.46% are Asian, 0.04% are Native Hawaiian and other Pacific Islander, 0.76% are some other race and 3.71% are multiracial.
St. Clair County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 5,688 is Hispanic or Latino (of any race), and 154,379 (96.45% of the total population) is Non-Hispanic.
The largest racial group in St. Clair County is White with a population of 148,323 (92.66% of the total population).

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

The peak population was 171,109 in the year 2006
From 2000 to 2010, St. Clair County's population decreased by 2,044 (1.24%), as compared to the national growth of 9.63%.
From 2010 to 2020, St. Clair County's population decreased by 2,313 (1.42%), 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. Clair County's population was lowest in year 2017 at 159,130.