US Census Data

McHenry County, Illinois

41 cities & places have their primary county here.

Population
311,366
+1.2%’19–’23
Median household income
$102,836
+18.5%’19–’23
Median home value
$286,900
+27.8%’19–’23

Home to 311,366 residents, McHenry County is one of Illinois's counties. 41 cities and places have their primary county here. Its median household income of $102,836 runs above the Illinois figure of $81,702.

From 2019 to 2023, McHenry County's population grew 1.2% from 307,714 to 311,366, while its median household income rose 18.5% from $86,799 to $102,836.

The typical home was built around 1989. 6.1% of residents live below the poverty line.

Demographics

ACS 2019–2023
Population
311,366
Median age
40.4 yrs
Median household income
$102,836
Median home value
$286,900
Median gross rent
$1,358
Housing units
120,605
Homeownership rate
82.6%
Bachelor's degree or higher
35.2%
Unemployment rate
4.7%

Trends

ACS 5-year · 2019–2023
Population
307,714311,366
Median household income
$86,799$102,836
Median home value
$224,500$286,900
Median gross rent
$1,197$1,358
YearPopulationMedian household incomeMedian home valueMedian gross rent
2019307,714$86,799$224,500$1,197
2020307,291$90,014$234,000$1,200
2021310,749$93,801$241,500$1,253
2022311,133$100,101$270,600$1,310
2023311,366$102,836$286,900$1,358

Each year is a US Census Bureau ACS 5-year estimate ending that year.

Age distribution

CountShare
Under 516,5205.3%
5 to 1755,13617.7%
18 to 2425,3218.1%
25 to 3435,94611.5%
35 to 4440,63413.1%
45 to 5442,79313.7%
55 to 6445,48414.6%
65 to 7430,7299.9%
75 and over18,8036.0%

Race & ethnicity

CountShare
White (non-Hispanic)239,56876.9%
Black or African American4,5121.4%
American Indian & Alaska Native1450.0%
Asian8,8242.8%
Native Hawaiian & Pacific Islander140.0%
Some other race7810.3%
Two or more races8,9652.9%
Hispanic or Latino (any race)48,55715.6%

Educational attainment (age 25+)

CountShare
No high school diploma13,4656.3%
High school graduate57,62326.9%
Some college or associate's67,85531.7%
Bachelor's degree49,93723.3%
Graduate or professional degree25,50911.9%

Commute to work

Mean travel time to work
31 min

How workers get to work

CountShare
Drove alone122,42774.9%
Carpooled11,5587.1%
Public transit2,2781.4%
Walked1,6221.0%
Bicycle990.1%
Worked from home24,01314.7%
Other means1,3680.8%

Travel time

CountShare
Under 15 min34,06424.4%
15 to 29 min40,51829.1%
30 to 44 min27,39119.7%
45 to 59 min18,43613.2%
60+ min18,94313.6%

Households

Average household size
2.66
Poverty rate
6.1% (18,764 of 309,151)
CountShare
Family households84,31372.5%
Nonfamily households32,01627.5%

Housing

Median year structure built
1989

Occupancy

CountShare
Occupied116,32996.5%
Vacant4,2763.5%

Tenure (of occupied units)

CountShare
Owner-occupied96,06382.6%
Renter-occupied20,26617.4%

Units in structure

CountShare
1-unit, detached93,29677.4%
1-unit, attached12,77810.6%
2 to 4 units4,4853.7%
5 to 19 units6,5785.5%
20 or more units2,6152.2%
Mobile home & other8530.7%

Geography

County GEOID
17111
State
Illinois
Land area
603 sq mi
Water area
7.67 sq mi
Center point
42.3243, -88.4522

Cities & places

41

Compare with nearby counties

5

Illinois rankings

21

Other counties in Illinois

101