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 | 22:33:24 (18th April 2026) |
| Population growth | -8.27% (2010-2020) |
| Weather | 51℉ Rain Showers 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
Rain showers likely before 1pm. Mostly sunny, with a high near 51. Northwest wind around 18 mph, with gusts as high as 29 mph. Chance of precipitation...
7-Day ForecastDemographics
According to census records, the population of Ontario decreased by 8.27% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 943 | - | census |
| 2011 | 932 | -1.18% | estimation process |
| 2012 | 926 | -0.65% | estimation process |
| 2013 | 925 | -0.11% | estimation process |
| 2014 | 920 | -0.54% | estimation process |
| 2015 | 912 | -0.88% | estimation process |
| 2016 | 905 | -0.77% | estimation process |
| 2017 | 899 | -0.67% | estimation process |
| 2018 | 889 | -1.12% | estimation process |
| 2019 | 882 | -0.79% | estimation process |
| 2020 | 871 | -1.26% | 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 |
| Truro | 18,532 | Human settlement in United States of America |
| 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 |
| Wataga | 773 | Human settlement in Illinois, United States of America |
| East Galesburg | 761 | Human settlement in Knox Township, Illinois, United States of America |
| Oneida | 653 | City in Illinois, USA |
| Yates City | 641 | Village in Illinois, United States |
| Williamsfield | 538 | Human settlement in Illinois, United States of America |
| Altona | 490 | Village in Illinois, United States |
| Victoria | 282 | Village in Illinois, United States |
| Rio | 280 | Village in Illinois, USA |
| Maquon | 259 | Township in Knox County, Illinois |
| Saint Augustine | 111 | Human settlement in Knox County, Illinois, United States of America |