RoadsideThoughts
A Gazetteer for the United States and Canada
Home >> State of California >> Marin County >> San AnselmoIndex...










Learn About
The Commemorative
Quarter for
California

The Commemorative Quarter for California





Welcome to San Anselmo ...

The town of San Anselmo is located in Marin County<1>.

While we don't have a date for the founding of San Anselmo, you might consider that their post office opened  in 1892.

The town was incorporated April 9, 1907.

From the  Census Estimates for 2019, San Anselmo has a population of 12,606 people<2> (see below for details).

San Anselmo is 70 feet [21 m] above sea level.<3>.

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

Area Codes for San Anselmo: 415 & 628<4>

The ZIP codes for San Anselmo: 94960, 94979<5>

Population Details ...

Taken from the 2019 Census Estimates, San Anselmo had an population of 12,606 people. This is an increase of 2.19% since the 2010 Census (or an increase of 1.84% since the 2000 Census).

At the time of the 2010 Census, San Anselmo had a population of 12,336 people. This makes San Anselmo the county's 4th most populous community.

The population of San Anselmo represents 0.03% of the population of California (which has 37,253,956 people), making it the state's 346th most populous community.

With a 2010 count of 12,336 people, the population of San Anselmo has remained roughly the same as the 2000 Census (which had a count of 12,378 people).

More information can be found on the Census Page for San Anselmo.

Websites for San Anselmo ...

Official Website: www.townofsananselmo.org/

Communities near San Anselmo ...

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

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

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

We also have a detailed list of newspapers that have been published in the area around San Anselmo. Our list includes 9 papers. See our Newspapers Page for San Anselmo.

TripAdvisor Tourism Pages for San Anselmo ...

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

Adding San Anselmo to Our Gazetteer ...

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

X2X - From that list, the San Anselmo post office opened in 1892.

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

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

The official website for San Anselmo: www.townofsananselmo.org/

The official website for Marin County: www.co.marin.ca.us/

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 Marin, 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 San Anselmo.
<3>The elevation is an estimate for the area around San Anselmo - 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 415 code has been Overlayed with the 628 area code. New phone numbers in the San Anselmo area will be assigned with one of these codes: 415 or 628. As a result, placing a call in the San Anselmo 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 town (such as San Anselmo). When looking for a ZIP Code, whether San Anselmo or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<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/




 

Copyright 2025
All Rights Reserved

Thank you for visiting our website.

In closing, please keep in mind that we can not guarantee the accuracy or timeliness of the information on this website, so use with care. We encourage you to double-check the information that is critical to you.

If you've found an error or have additional information that you would like to share, please don't hesitate to write: Click here to contact us.

This page was last modified/updated: 28 Apr 2025