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 and multiracial populations.

Population by Race

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%

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