Ontario, Illinois
Ontario: unincorporated community in Illinois.
About
Ontario is a city located in the county of Knox in the U.S. state of Illinois. Its population at the 2010 census was 943. After 10 years in 2020 city had an estimated population of 871 inhabitants.
Quick Facts about Ontario
| Population | 871 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| County | Knox County |
| Latitude & Longitude | 41.0787,-90.3076 |
| Altitude | 2,648 feet / 807 meters |
| Time Zone | Central Time Zone |
| Local time | 23:01:23 (16th September 2026) |
| Population growth | -7.64% (2010-2020) |
| Weather | 78℉ Showers And Thunderstorms Likely 7-days weather |
Geography
Ontario is located at 41°4'43"N 90°18'27"W (41.0786500, -90.3076300).
Ontario map
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Weather
Showers and thunderstorms likely before 4pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a high near 78. East northeast win...
7-Day ForecastDemographics
According to census records, the population of Ontario decreased by 7.64% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 943 | - | census |
| 2011 | 932 | -1.17% | estimation process |
| 2012 | 926 | -0.64% | estimation process |
| 2013 | 925 | -0.11% | estimation process |
| 2014 | 920 | -0.54% | estimation process |
| 2015 | 912 | -0.87% | estimation process |
| 2016 | 905 | -0.77% | estimation process |
| 2017 | 899 | -0.66% | estimation process |
| 2018 | 889 | -1.11% | estimation process |
| 2019 | 882 | -0.79% | estimation process |
| 2020 | 871 | -1.25% | estimation process |
Nearby Schools and Colleges
Schools and campuses linked to Ontario, IL. Select a name to open its map and contact details.
| Code | Name | City | ZIP |
|---|---|---|---|
| 143613 | Carl Sandburg College | Galesburg (IL) | 61401 |
Nearby Transit Stations (12)
Rail and bus stations connected to Ontario, IL. Select a station to open its map and address details.
| Code | Name | Address | Type |
|---|---|---|---|
| GBB | Galesburg station | 225 South Seminary Street | RAIL |
| KEE | Kewanee | Loomis and North Tremont Sts. | RAIL |
| MLI | Moline, Illinois | 1200 River Drive | BUS |
| RKI | Rock Island, IL | 3500 5th Avenue | BUS |
| DVP | Davenport, Iowa | 304 West River Drive | BUS |
Closest post offices linked to Ontario.
| Post Office Name | City | ZIP |
|---|---|---|
| Wataga Post Office | Wataga (IL) | 61488 |
Other cities in Knox County
Cities, towns, neighborhoods & other populated places in Knox County , IL.
| City Name | Population | Title |
|---|---|---|
| Galesburg | 29,803 | County seat of Knox County, Illinois, United States |
| Abingdon | 3,008 | City in Knox County, Illinois, United States of America |
| Knox | 2,692 | County seat of Knox County, Tennessee, United States; third-largest city in Tennessee |
| Knoxville | 2,692 | City in Knox County, Illinois, United States |