McHenry County Population

1840–2026

319.77K

2026 projection

3.2% since 2020 (increase)

050K100K150K200K250K300K350K1840186018801900192019401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for McHenry County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026319,772+2,0210.64%
2025317,751+2,0210.64%
2024315,730+2,3090.74%
2023313,421+1,5320.49%
2022311,889+1870.06%
2021311,702+1,7250.56%
2020309,977+2,5380.83%
2019307,439-7060.23%
2018308,145+3030.10%
2017307,842+7000.23%

Showing 10 of 33 years.

McHenry County Demographics

40.7median age

Median age

Female41.9 yrs
Male39.8 yrs

Adults

241,502
51,512 seniors (65+) · 21% of adults189,990 other adults

Sex

Female 49.9% · 155,893Male 50.1% · 156,698

Population by age

MaleFemale85+ years, male: 1,67485+ years, female: 3,44780–84 years, male: 2,09880–84 years, female: 3,04375–79 years, male: 4,66775–79 years, female: 4,89470–74 years, male: 6,07870–74 years, female: 6,87265–69 years, male: 9,26865–69 years, female: 9,47160–64 years, male: 10,52060–64 years, female: 10,94255–59 years, male: 12,10355–59 years, female: 11,69750–54 years, male: 11,09750–54 years, female: 11,05245–49 years, male: 10,02445–49 years, female: 9,87640–44 years, male: 10,40240–44 years, female: 9,72735–39 years, male: 10,47335–39 years, female: 10,48130–34 years, male: 9,78030–34 years, female: 9,27725–29 years, male: 8,87025–29 years, female: 8,44820–24 years, male: 9,17420–24 years, female: 8,55115–19 years, male: 11,16315–19 years, female: 10,30010–14 years, male: 11,10810–14 years, female: 10,6145–9 years, male: 9,6815–9 years, female: 9,2260–4 years, male: 8,5180–4 years, female: 7,97585+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45K5K10K10K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 3,126 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

McHenry County Income

$104,802median household income

Median household income

$104,802

Half of households earn more, half earn less

Median earnings

$60,427

Typical yearly pay for a worker 25 or older.

Poverty rate

6.2%

About 1 in 16 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

McHenry County Marital Status

55% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married55%56%54%
Never married29%32%27%
Divorced10%9%11%
Widowed5%3%7%
Separated<1%<1%<1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year