Ottawa

County:: LaSalle County
County Seat:: Yes
Area (mi²):: 14.895
State:: Illinois

Ottawa is a city located in LaSalle County, Illinois. Ottawa has a 2025 population of 18,691. It is also the county seat of LaSalle County. Ottawa is currently declining at a rate of -0.16% annually and its population has decreased by -0.81% since the most recent census, which recorded a population of 18,843 in 2020.

The average household income in Ottawa is $92,222 with a poverty rate of 14.44%.The median age in Ottawa is 40.3 years: 39 years for males, and 42.3 years for females.

Demographics

The racial composition of Ottawa includes 89.33% White, and smaller percentages for Black or African American, other race, Asian, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	16,717	89.33%
Two or more races	885	4.73%
Black or African American	537	2.87%
Other race	361	1.93%
Asian	213	1.14%
Native Hawaiian or Pacific Islander	1	0.01%

Ottawa Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Ottawa's average per capita income is $46,298. Household income levels show a median of $73,011. The poverty rate stands at 14.44%.

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	$106,518	-
Families	$86,372	$101,793
Households	$73,011	$92,222
Non Families	$43,243	$72,447

$46,298

Average Income

$73,011

Median Household Income

14.44%

Poverty Rate