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, Native American and multiracial populations.

Population by Race

White

Two or more races

Black or African American

Other race

Asian

Native Hawaiian or Pacific Islander

Native American

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%
Native American	0	0%

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