Welcome to Ontario ...
The city of Ontario is located in San Bernardino County<1>.
While we don't have a date for the founding of Ontario, you might get a feel for it by knowing that the earliest mention that we've found (so far) was in a book dated 1895.
When the people of Ontario refer to themselves (known as a demonym), they frequently use Ontarian<2>
From the Census Estimates for 2019, Ontario has a population of 181,636 people<3> (see below for details).
Ontario is 850 feet [259 m] above sea level.<4>.
Time Zone: Ontario lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time
Ontario is within the (909) area code.
The ZIP codes for Ontario: 91758, 91761-91762, 91764, 91798<5>
Websites for Ontario ...
Official Website: www.ci.ontario.ca.us/
Chamber of Commerce: www.ontario.org/
Population Details ...
Taken from the 2019 Census Estimates, Ontario had an population of 181,636 people. This is an increase of 10.81% since the 2010 Census (or an increase of 14.95% since the 2000 Census).
At the time of the 2010 Census, Ontario had a population of 163,924 people (or 8.05% of the total population of San Bernardino County). This makes Ontario the county's 4th most populous community.
The population of Ontario represents 0.44% of the total population of California (which has 37,253,956 people), making it the state's 29th most populous community.
With a 2010 count of 163,924 people, the population of Ontario increased 3.74% from the 2000 Census (which had a count of 158,007 people).
More information can be found on the Census Page for Ontario.
Communities Also Named Ontario ...
Using our Gazetteer, we found that there are 13 communities that are also named Ontario - they are located in Illinois, Indiana, Iowa, Kansas, Michigan, New York, Ohio, Oklahoma, Oregon, Pennsylvania, Utah, Virginia and Wisconsin.
For more information, see our Tidbits & Trivia Page for Ontario.
Communities near Ontario ...
We have created a list of 10 communities that are near Ontario.
- Riverside
(16 miles [25.7 km] to the southeast)- Jump to our Gazetteer entry for Riverside
- Riverside is located in Riverside County
- Population from the 2020 Census: 330,786 people
- Jump to TripAdvisor's Tourism page for Riverside <6>
- Fontana
(12 miles [19.3 km] to the east)- Jump to our Gazetteer entry for Fontana
- Fontana is located in San Bernardino County
- Population from the 2020 Census: 216,173 people
- Jump to TripAdvisor's Tourism page for Fontana <6>
- Corona
(13 miles [20.9 km] to the south)- Jump to our Gazetteer entry for Corona
- Corona is located in Riverside County
- Population from the 2020 Census: 170,996 people
- Jump to TripAdvisor's Tourism page for Corona <6>
- Jurupa Valley
(10 miles [16.1 km] to the east)- Jump to our Gazetteer entry for Jurupa Valley
- Jurupa Valley is located in Riverside County
- Population from the 2020 Census: 109,745 people
- Rialto
(16 miles [25.7 km] to the east)- Jump to our Gazetteer entry for Rialto
- Rialto is located in San Bernardino County
- Population from the 2020 Census: 104,132 people
- Jump to TripAdvisor's Tourism page for Rialto <6>
- West Covina
(16 miles [25.7 km] to the west)- Jump to our Gazetteer entry for West Covina
- West Covina is located in Los Angeles County
- Population from the 2020 Census: 103,656 people
- Jump to TripAdvisor's Tourism page for West Covina <6>
- Chino Hills
(6 miles [9.7 km] to the southwest)- Jump to our Gazetteer entry for Chino Hills
- Chino Hills is located in San Bernardino County
- Estimated population in 2015: 78,309 people
- Jump to TripAdvisor's Tourism page for Chino Hills <6>
- Baldwin Park
(18 miles [29 km] to the west)- Jump to our Gazetteer entry for Baldwin Park
- Baldwin Park is located in Los Angeles County
- Population from the 2020 Census: 74,480 people
- Jump to TripAdvisor's Tourism page for Baldwin Park <6>
- Yorba Linda
(15 miles [24.1 km] to the southwest)- Jump to our Gazetteer entry for Yorba Linda
- Yorba Linda is located in Orange County
- Population from the 2020 Census: 68,027 people
- Jump to TripAdvisor's Tourism page for Yorba Linda <6>
- Eastvale
(8 miles [12.9 km] to the southeast)- Jump to our Gazetteer entry for Eastvale
- Eastvale is located in Riverside County
- Jump to TripAdvisor's Tourism page for Eastvale <6>
To Help With Your Genealogy Research ...
We have a couple of sections for those tracing their genealogy.
We created a list of cemeteries that are in the area around Ontario. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for Ontario.
Using the information from an 1895 Atlas, we've created a list of communities that were in the area of Ontario. Our list includes information such as whether the 1895 community had a post office or railroad service. See our List of 1890's Communities around Ontario.
We also have a detailed list of newspapers that have been published in the area around Ontario. Our list includes 21 papers. See our Newspapers Page for Ontario.
TripAdvisor Tourism Pages for Ontario ...
Looking for more information about Ontario? A wonderful source is the TripAdvisor website. We always start with the TripAdvisor Tourism page, where you can read an overview with links that will help you find lodging, restaurants and attractions.
In addition to the Tourism page for Ontario, there are neighboring communities that also have Tourism pages. More information about those communities can be found on our TripAdvisor Page for Ontario.
Adding Ontario to Our Gazetteer ...
We originally found mention of Ontario in both the FIPS-55 and the GNIS. For more information, see the FIPS and GNIS Codes sections on our Miscellaneous Page.
From our notes, the earliest published mention we've found for Ontario was in the book titled Business Atlas and Shippers' Guide (1895).
We also found Ontario mentioned on a train schedule titled Southern Pacific Railroad Time Tables (August 1903).
For more details, see References and Mentions for Ontario.
Off-the-Road Links ...
The official website for Ontario: www.ci.ontario.ca.us/
The official website for San Bernardino County: www.sbcounty.gov/
The official website for State of California: https://www.ca.gov/
Footnotes ...
| <1> | If you're interested in how the shape of California's counties, including San Bernardino, have changed over time, we recommend the Atlas of Historical County Boundaries. |
| <2> | A demonym is the name for a resident of a community which is usually derived from (or is related to) the name of that community. In other words, it's how the residents of Ontario refer to themselves. It's important to note that there aren't any rules for taking a city's name and turning it into a demonym. A demonym is informal and while the majority of Ontario may use one name, keep in mind that others may use something different. |
| <3> | Population counts have been provided by the U.S. Census Bureau. For more detail, please visit our Census Page for Ontario. |
| <4> | The elevation is an estimate for the area around Ontario - it will be higher in some places and lower in others. |
| <5> | ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a city (such as Ontario). When looking for a ZIP Code, whether Ontario or elsewhere, it's always best to check the website of the United States Postal Service (USPS). Our list of ZIP Codes for Ontario includes: 91758, 91761, 91764 & 91798. |
| <6> | While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program. |