Somonauk township

County:: DeKalb County
County Seat:: No
Area (mi²):: 19.265
State:: Illinois

Somonauk township is located in DeKalb County, Illinois. Somonauk township has a 2025 population of 1,941. Somonauk township is currently declining at a rate of -0.67% annually and its population has decreased by -2.76% since the most recent census, which recorded a population of 1,996 in 2020.

The average household income in Somonauk township is $112,366 with a poverty rate of 3.7%. The median age in Somonauk township is 45.5 years: 46.4 years for males, and 43 years for females.

Demographics

The racial composition of Somonauk township includes 94.84% 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	1,691	94.84%
Two or more races	56	3.14%
Other race	24	1.35%
Black or African American	12	0.67%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%

Somonauk township Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Somonauk township's average per capita income is $54,341. Household income levels show a median of $95,500. The poverty rate stands at 3.7%.

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	$112,411	-
Families	$103,333	$128,790
Households	$95,500	$112,366
Non Families	$54,071	$67,251

$54,341

Average Income

$95,500

Median Household Income

3.7%

Poverty Rate