What is the population of Ontario?

The population of Ontario, IL is 871.

Where is Ontario located?

Ontario, IL is located at latitude 41.0786500 and longitude -90.3076300. It is in United States.

What is the elevation of Ontario?

Ontario, IL has an elevation of 246 meters (807 feet) above sea level.

What time zone is Ontario in?

Ontario, IL is in the America/Chicago time zone.

What state is Ontario in?

Ontario is in the state of Illinois, United States.

What county is Ontario, IL in?

Ontario is in Knox County, Illinois.

How has the population of Ontario changed?

The population of Ontario, IL has decreased from 943 (2010) to 871 (2020), a change of -7.6%.

Ontario, IL - Geographic Facts & Maps

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	22:21:56 (1st November 2026)
Population growth	-7.64% (2010-2020)
Weather	54℉ Slight Chance Light Rain 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

54°F

Slight Chance Light Rain

6 mph ESE Overnight

A slight chance of rain. Cloudy, with a low around 54. East southeast wind around 6 mph, with gusts as high as 17 mph. Chance of precipitation is 20%.

7-Day Forecast

Demographics

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

Nearby Post Offices

Closest post offices linked to Ontario.

Post Office Name	City	ZIP
Wataga Post Office	Wataga (IL)	61488

Other places with the same name (4)

Ontario, California The second most populous city in San Bernardino County, California. with a population of 183,393 people.
Ontario, Oregon city in Oregon, USA. with a population of 11,140 people.
Ontario, New York human settlement in United States of America. with a population of 10,173 people.
Ontario, Ohio city in Ohio, USA. with a population of 6,102 people.

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

Ontario, Illinois