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

San Quentin is located in Marin County<1>.

While we don't have a date for the founding of San Quentin, you might consider that their post office opened  in 1859.

San Quentin is near sea level<2>.

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

Area Codes for San Quentin: 415 & 628<3>

The ZIP codes for San Quentin: 94964, 94974<4>

Communities near San Quentin ...

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

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

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

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

TripAdvisor Tourism Pages for San Quentin ...

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

Adding San Quentin to Our Gazetteer ...

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

From that list, the San Quentin post office opened in 1859.

We also found San Quentin in the book titled List of Post Offices in the United States (1870).

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

Footnotes ...

<1>If you're interested in how the shape of California's counties, including Marin, have changed over time, we recommend the Atlas of Historical County Boundaries.
<2>The elevation is an estimate for the area around San Quentin - 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 415 code has been Overlayed with the 628 area code. New phone numbers in the San Quentin area will be assigned with one of these codes: 415 or 628. As a result, placing a call in the San Quentin 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 San Quentin). When looking for a ZIP Code, whether San Quentin 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/