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 and multiracial populations.

Population by Race

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%

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