RoadsideThoughts
A Gazetteer for the United States and Canada
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Welcome to Twin Peaks ...

Twin Peaks is located in San Bernardino County<1>.

While we don't have a date for the founding of Twin Peaks, you might consider that their post office opened  in 1916.

Twin Peaks is 5,770 feet [1,759 m] above sea level.<2> In other words, the altitude of Twin Peaks is about 1 mile [or 1¾ km] above sea level.

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

Area Codes for Twin Peaks: 909 & 840<3>

The ZIP code for Twin Peaks: 92391<4>

Communities Also Named Twin Peaks ...

Using our Gazetteer, we found that there are 2 communities that are also named Twin Peaks - they are located in Alaska and Utah.

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

Communities near Twin Peaks ...

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

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

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

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

TripAdvisor Tourism Pages for Twin Peaks ...

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

Adding Twin Peaks to Our Gazetteer ...

We originally found mention of Twin Peaks 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 Twin Peaks was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<6>

From that list, the Twin Peaks post office opened in 1916.

For more details, see References and Mentions for Twin Peaks.

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>The elevation is an estimate for the area around Twin Peaks - 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 909 code has been Overlayed with the 840 area code. New phone numbers in the Twin Peaks area will be assigned with one of these codes: 909 or 840. As a result, placing a call in the Twin Peaks area will require 10-digit dialing (where you enter both the area code and then the phone number).
<4>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 community (such as Twin Peaks). When looking for a ZIP Code, whether Twin Peaks or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<5>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.
<6>A copy of their list with background information can be found at:

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