McHenry County, Illinois Age & Gender Distribution (2024)
Population distribution by age and gender for McHenry County, Illinois
McHenry County, Illinois Age & Gender Statistics (2024)
Total Population
312,591
Median Age
40.7
Male Median
39.8
Female Median
41.9
McHenry County, Illinois Population Growth
McHenry County, Illinois Demographic Trend
Since 2010, the population of has changed by +2.1%%.
+2.1%% Growth
McHenry County, Illinois Age & Gender Pyramid
Figure 2: Population distribution by age and gender for 2024.
McHenry County, Illinois Historical Population Data
| Year | Median Age | Population |
|---|---|---|
| 2024 | 40.7 | 312,591 |
| 2023 | 40.4 | 311,366 |
| 2022 | 40.5 | 311,133 |
| 2021 | 40.4 | 310,749 |
| 2020 | 40.2 | 307,291 |
| 2019 | 40.2 | 307,714 |
| 2018 | 40.2 | 307,789 |
| 2017 | 39.9 | 308,043 |
| 2016 | 39.6 | 307,083 |
| 2015 | 39.3 | 307,357 |
| 2014 | 38.9 | 307,888 |
| 2013 | 38.4 | 308,060 |
| 2012 | 38.0 | 308,163 |
| 2011 | 37.6 | 307,721 |
| 2010 | 37.1 | 306,050 |
McHenry County, Illinois Age Group Breakdown (2024)
| Age Cohort | Percentage |
|---|---|
| Under 5 | 5.3% |
| 5–17 | 17.5% |
| 18–24 | 8.1% |
| 25–34 | 11.6% |
| 35–54 | 26.6% |
| 55–64 | 14.5% |
| 65+ | 16.5% |
Dependency Ratios for McHenry County, Illinois
- Total Dependency Ratio:
- 64.5
- Youth Dependency:
- 37.4
- Old-Age Dependency:
- 27.1
The dependency ratio measures dependents (ages 0-17 and 65+) per 100 working-age individuals (ages 18-64).
Age & Gender FAQs for McHenry County, Illinois
The median age in McHenry County, Illinois is 40.7 years.
According to latest Census data, the total population of McHenry County, Illinois is 312,591.
In McHenry County, Illinois, seniors (ages 65+) make up 16.5% of the population, while children under 18 represent 17.5%.
Based on historical data since 2010, the population in McHenry County, Illinois is aging.