Jefferson County, IL Population

Overview

37,362

Total Population

41.2

Median age

48.05%

Female population %

108.1:100

Gender ratio (M:F)

55-59 years

Largest age group

60.4

Total dependency ratio

White

Largest racial group

1,089

Hispanic population

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

TABLE OF CONTENTS

Age

Jefferson County's population is old compared to the rest of the country:

The median age in Jefferson County is 41.2, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Jefferson County's population under 18 was 22.45%, compared to the 22.51% nationwide.
Jefferson County's elderly or the senior population (over 65 age) was 19.02% as compared to 16.04% nationwide.
Of the total population in Jefferson County, 18.63% were under the age of 15, 17.57% aged 15 to 29, 44.78% aged 30 to 64, 16.94% aged 65 to 84, and 2.08% were 85 years of age and older.

There are 1,456 less females than males in Jefferson County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 48.05% females and 51.95% males in Jefferson County, IL.
The Jefferson County, IL gender ratio is 108.1:100 i.e. 108.1 men to 100 women (1.081).
For male population, the largest age group is 55-59 years with a population of 1,349.
For the female population, the largest age group is 5-9 years with a population of 1,250.

Jefferson County's population has become increasingly diverse:

Racial distribution of Jefferson County population: 85.98% are White, 8.20% are Black or African American, 0.18% are American Indian and Alaska Native, 1.10% are Asian, 0.02% are Native Hawaiian and other Pacific Islander, 0.42% are some other race and 4.09% are multiracial.
Jefferson County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 1,089 is Hispanic or Latino (of any race), and 36,273 (97.09% of the total population) is Non-Hispanic.
The largest racial group in Jefferson County is White with a population of 32,125 (85.98% of the total population).

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

The peak population was 40,342 in the year 2006
From 2000 to 2010, Jefferson County's population decreased by 1,340 (3.34%), as compared to the national growth of 9.63%.
From 2010 to 2020, Jefferson County's population decreased by 1,759 (4.54%), 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, Jefferson County's population was lowest in year 2022 at 36,400.