RoadsideThoughts
A Gazetteer for the United States and Canada
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Welcome to San Onofre ...

San Onofre is located in San Diego County<1>.

While we don't have a date for the founding of San Onofre, you might consider that their post office opened  in 1917.

San Onofre is near sea level<2>.

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

Area Codes for San Onofre: 760 & 442<3>

Communities near San Onofre ...

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

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

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

We also have a detailed list of newspapers that have been published in the area around San Onofre. See our Newspapers Page for San Onofre.

TripAdvisor Tourism Pages for San Onofre ...

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

Adding San Onofre to Our Gazetteer ...

We originally found mention of San Onofre 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 San Onofre was in the book titled Business Atlas and Shippers' Guide (1895).

We also found San Onofre in the book titled .<5> X3X - From that list, the San Onofre post office opened in 1917.

For more details, see References and Mentions for San Onofre.

Footnotes ...

<1>If you're interested in how the shape of California's counties, including San Diego, have changed over time, we recommend the Atlas of Historical County Boundaries.
<2>The elevation is an estimate for the area around San Onofre - it will be higher in some places and lower in others.
<3>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 760 code has been Overlayed with the 442 area code. New phone numbers in the San Onofre area will be assigned with one of these codes: 760 or 442. As a result, placing a call in the San Onofre area will require 10-digit dialing (where you enter both the area code and then the phone number).
<4>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.
<5>A copy of their list with background information can be found at:

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