RoadsideThoughts
A Gazetteer for the United States and Canada
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Welcome to Port Costa ...

Port Costa is located in Contra Costa County<1>.

Port Costa was established in 1879.

A typical abbreviation for Port Costa: Prt. Costa

Port Costa is near sea level<2>.

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

Area Codes for Port Costa: 510 & 341<3>

The ZIP code for Port Costa: 94569<4>

Communities near Port Costa ...

We have created a list of 10 communities that are near Port Costa.

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

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

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

TripAdvisor Tourism Pages for Port Costa ...

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

Adding Port Costa to Our Gazetteer ...

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

From that list, the Port Costa post office opened in 1881.

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

For more details, see References and Mentions for Port Costa.

Footnotes ...

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