Cook County, IL Population

Overview

5.27 million

Total Population

37.3

Median age

51.18%

Female population %

95.4:100

Gender ratio (M:F)

25-29 years

Largest age group

48.9

Total dependency ratio

White

Largest racial group

1.35 million

Hispanic population

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

TABLE OF CONTENTS

Age

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

The median age in Cook County is 37.3, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
Cook County's population under 18 was 21.87%, compared to the 22.51% nationwide.
Cook County's elderly or the senior population (over 65 age) was 14.71% as compared to 16.04% nationwide.
Of the total population in Cook County, 18.15% were under the age of 15, 20.52% aged 15 to 29, 46.63% aged 30 to 64, 12.80% aged 65 to 84, and 1.90% were 85 years of age and older.

There are 124,442 more females than males in Cook County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 51.18% females and 48.82% males in Cook County, IL.
The Cook County, IL gender ratio is 95.4:100 i.e. 95.4 men to 100 women (0.954).
For male population, the largest age group is 25-29 years with a population of 211,273.
For the female population, the largest age group is 25-29 years with a population of 215,801.

Cook County's population has become increasingly diverse:

Racial distribution of Cook County population: 52.04% are White, 23% are Black or African American, 0.43% are American Indian and Alaska Native, 7.54% are Asian, 0.04% are Native Hawaiian and other Pacific Islander, 9.94% are some other race and 7% are multiracial.
Cook County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 1.35 million is Hispanic or Latino (of any race), and 3.92 million (74.42% of the total population) is Non-Hispanic.
The largest racial group in Cook County is White with a population of 2.74 million (52.04% of the total population).

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

The peak population was 5,376,751 in the year 2000
From 2000 to 2010, Cook County's population decreased by 177,774 (3.31%), as compared to the national growth of 9.63%.
From 2010 to 2020, Cook County's population increased by 62,272 (1.20%), 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, Cook County's population was lowest in year 2022 at 5,109,292.