DeKalb County, IL Population

Overview

100,922

Total Population

31.4

Median age

50.39%

Female population %

98.5:100

Gender ratio (M:F)

20-24 years

Largest age group

44.1

Total dependency ratio

White

Largest racial group

11,909

Hispanic population

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

TABLE OF CONTENTS

Age

DeKalb County's population is young compared to the rest of the country:

The median age in DeKalb County is 31.4, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
DeKalb County's population under 18 was 21.69%, compared to the 22.51% nationwide.
DeKalb County's elderly or the senior population (over 65 age) was 12.65% as compared to 16.04% nationwide.
Of the total population in DeKalb County, 17.96% were under the age of 15, 30.03% aged 15 to 29, 39.37% aged 30 to 64, 11.16% aged 65 to 84, and 1.48% were 85 years of age and older.

There are 788 more females than males in DeKalb County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 50.39% females and 49.61% males in DeKalb County, IL.
The DeKalb County, IL gender ratio is 98.5:100 i.e. 98.5 men to 100 women (0.985).
For male population, the largest age group is 20-24 years with a population of 7,072.
For the female population, the largest age group is 20-24 years with a population of 7,076.

DeKalb County's population has become increasingly diverse:

Racial distribution of DeKalb County population: 81.08% are White, 7.89% are Black or African American, 0.20% are American Indian and Alaska Native, 2.29% are Asian, 0.03% are Native Hawaiian and other Pacific Islander, 3.82% are some other race and 4.69% are multiracial.
DeKalb County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 11,909 is Hispanic or Latino (of any race), and 89,013 (88.20% of the total population) is Non-Hispanic.
The largest racial group in DeKalb County is White with a population of 81,826 (81.08% of the total population).

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

The peak population was 107,251 in the year 2009
From 2000 to 2010, DeKalb County's population increased by 15,852 (17.75%), as compared to the national growth of 9.63%.
From 2010 to 2020, DeKalb County's population decreased by 4,898 (4.66%), 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, DeKalb County's population was lowest in year 2000 at 89,299.