Ottawa Flag

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 .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.

18.7K
Total Population
1,255
Density (mi²)
-30 -0.16%
Growth

Ottawa Population

Ottawa Population

Data after 2023 is projected based on recent change

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)
White16,71789.33%
Two or more races8854.73%
Black or African American5372.87%
Other race3611.93%
Asian2131.14%
Native Hawaiian or Pacific Islander10.01%
Native American00%

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

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)