RoadsideThoughts
A Gazetteer for the United States and Canada
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Welcome to Castro Valley ...

Castro Valley is located in Alameda County<1>.

A typical abbreviation for Castro Valley: Castro Vly. (or less commonly used: Castro Vally. or Castro Vlly.)

Castro Valley is 160 feet [49 m] above sea level.<2>.

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

Area Codes for Castro Valley: 510 & 341<3>

The ZIP codes for Castro Valley: 94546, 94552<4>

Communities near Castro Valley ...

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

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

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

We also have a detailed list of newspapers that have been published in the area around Castro Valley. Our list includes 6 papers. See our Newspapers Page for Castro Valley.

TripAdvisor Tourism Pages for Castro Valley ...

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

Adding Castro Valley to Our Gazetteer ...

We originally found mention of Castro Valley 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 Castro Valley was in the book titled SPV's Comprehensive Railroad Atlas of North America - California & Nevada.

For more details, see References and Mentions for Castro Valley.

Footnotes ...

<1>If you're interested in how the shape of California's counties, including Alameda, have changed over time, we recommend the Atlas of Historical County Boundaries.
<2>The elevation is an estimate for the area around Castro Valley - 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 510 code has been Overlayed with the 341 area code. New phone numbers in the Castro Valley area will be assigned with one of these codes: 510 or 341. As a result, placing a call in the Castro Valley 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 Castro Valley). When looking for a ZIP Code, whether Castro Valley 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.