Welcome to Union City ...

The city of Union City is located in Alameda County<1>.

While we don't have a date for the founding of Union City, you might consider that their post office opened  in 1959.

The city was incorporated January 26, 1959.

From the  Census Estimates for 2019, Union City has a population of 75,324 people<2> (see below for details).

Union City is 90 feet [27 m] above sea level.<3>.

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

Union City lies within the (510) area code.

The ZIP code for Union City: 94587<4>

In the past, Union City was named Decoto.

Websites for Union City ...

Official Website: www.ci.union-city.ca.us/

Population Details ...

Taken from the 2019 Census Estimates, Union City had an population of 75,324 people. This is an increase of 8.35% since the 2010 Census (or an increase of 12.64% since the 2000 Census).

At the time of the 2010 Census, Union City had a population of 69,516 people. This makes Union City the county's 9th most populous community.

The population of Union City represents 0.19% of the population of California (which has 37,253,956 people), making it the state's 114th most populous community.

With a 2010 count of 69,516 people, the population of Union City increased 3.96% from the 2000 Census (with a count of 66,869 people).

More information can be found on the Census Page for Union City.

Communities Also Named Union City ...

Using our Gazetteer, we found that there are 22 communities that are also named Union City - they are located in Arkansas, Connecticut, Florida, Georgia, Indiana, Kansas (6), Kentucky (2), Michigan, Missouri (2), New Jersey, Ohio, Oklahoma, Pennsylvania, Tennessee and West Virginia.

For more information, see our Tidbits & Trivia Page for Union City.

Communities near Union City ...

We have created a list of 10 communities that are near Union City.

• San Jose
  (19 miles [30.6 km] to the southeast)
  • Jump to our Gazetteer entry for San Jose
  • San Jose is located in Santa Clara County
  • Population from the 2020 Census: 1,013,616 people
  • Jump to TripAdvisor's Tourism page for San Jose <5>
• Oakland
  (19 miles [30.6 km] to the northwest)
  • Jump to our Gazetteer entry for Oakland
  • Oakland is located in Alameda County
  • Population from the 2020 Census: 424,891 people
  • Jump to TripAdvisor's Tourism page for Oakland <5>
• Sunnyvale
  (15 miles [24.1 km] to the south)
  • Jump to our Gazetteer entry for Sunnyvale
  • Sunnyvale is located in Santa Clara County
  • Population from the 2020 Census: 151,746 people
  • Jump to TripAdvisor's Tourism page for Sunnyvale <5>
• Santa Clara
  (16 miles [25.7 km] to the south)
  • Jump to our Gazetteer entry for Santa Clara
  • Santa Clara is located in Santa Clara County
  • Population from the 2020 Census: 131,055 people
  • Jump to TripAdvisor's Tourism page for Santa Clara <5>
• San Mateo
  (15 miles [24.1 km] to the west)
  • Jump to our Gazetteer entry for San Mateo
  • San Mateo is located in San Mateo County
  • Population from the 2020 Census: 102,398 people
  • Jump to TripAdvisor's Tourism page for San Mateo <5>
• Livermore
  (16 miles [25.7 km] to the northeast)
  • Jump to our Gazetteer entry for Livermore
  • Livermore is located in Alameda County
  • Population from the 2020 Census: 91,617 people
  • Jump to TripAdvisor's Tourism page for Livermore <5>
• San Leandro
  (11 miles [17.7 km] to the northwest)
  • Jump to our Gazetteer entry for San Leandro
  • San Leandro is located in Alameda County
  • Population from the 2020 Census: 89,161 people
  • Jump to TripAdvisor's Tourism page for San Leandro <5>
• Redwood City
  (12 miles [19.3 km] to the southwest)
  • Jump to our Gazetteer entry for Redwood City
  • Redwood City is located in San Mateo County
  • Population from the 2020 Census: 84,466 people
  • Jump to TripAdvisor's Tourism page for Redwood City <5>
• San Ramon
  (13 miles [20.9 km] to the north)
  • Jump to our Gazetteer entry for San Ramon
  • San Ramon is located in Contra Costa County
  • Population from the 2020 Census: 82,865 people
  • Jump to TripAdvisor's Tourism page for San Ramon <5>
• Pleasanton
  (10 miles [16.1 km] to the northeast)
  • Jump to our Gazetteer entry for Pleasanton
  • Pleasanton is located in Alameda County
  • Population from the 2020 Census: 80,247 people
  • Jump to TripAdvisor's Tourism page for Pleasanton <5>

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

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

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

TripAdvisor Tourism Pages for Union City ...

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

Adding Union City to Our Gazetteer ...

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

From that list, the Union City post office opened in 1959.

For more details, see References and Mentions for Union City.

Off-the-Road Links ...

The official website for Union City: www.ci.union-city.ca.us/

The official website for Alameda County: www.acgov.org/

The official website for State of California: https://www.ca.gov/