McHenry County, IL Population

Overview

310,749

Total Population

40.4

Median age

49.99%

Female population %

1:100

Gender ratio (M:F)

55-59 years

Largest age group

50.7

Total dependency ratio

White

Largest racial group

42,981

Hispanic population

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

TABLE OF CONTENTS

Age

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

The median age in McHenry County is 40.4, compared to 38.8 nationwide, according to the American Community Survey 2017 - 2021 5 Year estimates.
McHenry County's population under 18 was 23.46%, compared to the 22.51% nationwide.
McHenry County's elderly or the senior population (over 65 age) was 14.81% as compared to 16.04% nationwide.
Of the total population in McHenry County, 18.84% were under the age of 15, 18.44% aged 15 to 29, 47.91% aged 30 to 64, 13.15% aged 65 to 84, and 1.66% were 85 years of age and older.

There are 71 less females than males in McHenry County:

The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 49.99% females and 50.01% males in McHenry County, IL.
The McHenry County, IL gender ratio is 1:100 i.e. 1 men to 100 women (1.000).
For male population, the largest age group is 55-59 years with a population of 13,109.
For the female population, the largest age group is 55-59 years with a population of 12,030.

McHenry County's population has become increasingly diverse:

Racial distribution of McHenry County population: 88.67% are White, 1.52% are Black or African American, 0.15% are American Indian and Alaska Native, 2.72% are Asian, 0% are Native Hawaiian and other Pacific Islander, 1.75% are some other race and 5.19% are multiracial.
McHenry County's racial breakdown clearly shows that there is an absolute majority of White population in the county.
By ethnicity, 42,981 is Hispanic or Latino (of any race), and 267,768 (86.17% of the total population) is Non-Hispanic.
The largest racial group in McHenry County is White with a population of 275,551 (88.67% of the total population).

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

The peak population was 316,830 in the year 2009
From 2000 to 2010, McHenry County's population increased by 47,812 (18.30%), as compared to the national growth of 9.63%.
From 2010 to 2020, McHenry County's population increased by 765 (0.25%), 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, McHenry County's population was lowest in year 2000 at 261,309.