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Welcome to Rialto ...

The city of Rialto is located in San Bernardino County<1>.

While we don't have a date for the founding of Rialto, you might consider that their post office opened  in 1888.

The city was incorporated November 17, 1911.

From the  Census Estimates for 2019, Rialto has a population of 103,847 people<2> (see below for details).

Rialto is 1,320 feet [402 m] above sea level.<3>.

Time Zone: Rialto lies in the Pacific Time Zone (PST/PDT) and observes daylight saving time

Area Codes for Rialto: 909 & 840<4>

The ZIP codes for Rialto: 92376-92377<5>

Population Details ...

Taken from the 2019 Census Estimates, Rialto had an population of 103,847 people. This is an increase of 4.72% since the 2010 Census (or an increase of 13.03% since the 2000 Census).

At the time of the 2010 Census, Rialto had a population of 99,171 people. This makes Rialto the county's 6th most populous community.

The population of Rialto represents 0.27% of the total population of California (which has 37,253,956 people), making it the state's 69th most populous community.

With a 2010 count of 99,171 people, the population of Rialto increased 7.94% from the 2000 Census (which had a count of 91,873 people).

More information can be found on the Census Page for Rialto.

Communities Also Named Rialto ...

Using our Gazetteer, we found that there are 4 communities that are also named Rialto - they are located in Missouri, North Carolina, Ohio and Tennessee.

For more information, see our Tidbits & Trivia Page for Rialto.

Websites for Rialto ...

Official Website:   www.ci.rialto.ca.us/

Chamber of Commerce:   www.rialtochamber.org/

Communities near Rialto ...

We have created a list of 10 communities that are near Rialto.

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 Rialto. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for Rialto.

Using the information from an 1895 Atlas, we've created a list of communities that were in the area of Rialto. 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 Rialto.

We also have a detailed list of newspapers that have been published in the area around Rialto. Our list includes 11 papers. See our Newspapers Page for Rialto.

TripAdvisor Tourism Pages for Rialto ...

Looking for more information about Rialto? 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 Rialto, there are neighboring communities that also have Tourism pages. More information about those communities can be found on our TripAdvisor Page for Rialto.

Adding Rialto to Our Gazetteer ...

We originally found mention of Rialto 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 Rialto was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<7>

X2X - From that list, the Rialto post office opened in 1888.

We also found Rialto in the book titled Business Atlas and Shippers' Guide (1895).

For more details, see References and Mentions for Rialto.

The official website for Rialto: www.ci.rialto.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>Population counts have been provided by the U.S. Census Bureau. For more detail, please visit our Census Page for Rialto.
<3>The elevation is an estimate for the area around Rialto - it will be higher in some places and lower in others.
<4>When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 909 code has been Overlayed with the 840 area code. New phone numbers in the Rialto area will be assigned with one of these codes: 909 or 840. As a result, placing a call in the Rialto area will require 10-digit dialing (where you enter both the area code and then the phone number).
<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 Rialto). When looking for a ZIP Code, whether Rialto or elsewhere, it's always best to check the website of the United States Postal Service (USPS).

Our list of ZIP Codes for Rialto includes: 92376 & 92377.
<6>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.
<7>A copy of their list with background information can be found at:

      https://cblevins.github.io/us-post-offices/data-biography/




 

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This page was last modified/updated: 21 Apr 2025