Marengo

County:: McHenry County
County Seat:: No
Area (mi²):: 8.902
State:: Illinois

Marengo is a city located in McHenry County, Illinois. Marengo has a 2025 population of 7,643. Marengo is currently growing at a rate of 0.24% annually and its population has increased by 1.16% since the most recent census, which recorded a population of 7,555 in 2020.

The average household income in Marengo is $88,436 with a poverty rate of 15.55%. The median age in Marengo is 33.3 years: 32.7 years for males, and 33.9 years for females.

Demographics

The racial composition of Marengo includes 92.03% White, and smaller percentages for other race, Black or African American, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Two or more races

Other race

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	6,555	92.03%
Two or more races	373	5.24%
Other race	104	1.46%
Black or African American	91	1.28%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%

Marengo Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Marengo's average per capita income is $56,276. Household income levels show a median of $72,586. The poverty rate stands at 15.55%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$132,681	-
Families	$112,866	$106,243
Households	$72,586	$88,436
Non Families	$34,602	$50,516

$56,276

Average Income

$72,586

Median Household Income

15.55%

Poverty Rate