Ontario Flag

Ontario

County:
Knox County
County Seat:
No
Area (mi²):
36.186
State:
Illinois

Ontario is located in Knox County, Illinois. Ontario has a 2025 population of 897 . Ontario is currently growing at a rate of 0.11% annually but its population has decreased by -2.18% since the most recent census, which recorded a population of 917 in 2020.

The average household income in Ontario is $84,739 with a poverty rate of 2.4%. The median age in Ontario is 33 years: 26.5 years for males, and 34.6 years for females. For every 100 females there are 90.0 males.

897
Total Population
25
Density (mi²)
1 0.11%
Growth

Ontario Population

Ontario Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Ontario includes 94.93% White, and smaller percentages for Asian, Two or more races, other race, Black or African American and multiracial populations.

Population by Race

White (94.93%)

Asian (2.67%)

Two or more races (1.29%)

Other race (0.83%)

Black or African American (0.28%)

Race
Population
Percentage (of total)
White1,03094.93%
Asian292.67%
Two or more races141.29%
Other race90.83%
Black or African American30.28%

Ontario Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Ontario's average per capita income is $45,329. Household income levels show a median of $69,786. The poverty rate stands at 2.4%.

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$96,667-
Families$88,750$98,552
Households$69,786$84,739
Non Families$35,714$49,943

$45,329

Average Income

$69,786

Median Household Income

2.4%

Poverty Rate

Nearby Cities

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)