Where is Union City, California, U.S.

Written and Fact-checked by | Updated On: May 11, 2026

Where is Union City, California Located in the United States? - Union City is a city located in the Alameda County in California, United States. Union City lies between 37.5934 Degrees North latitudes and -122.0438 Degrees West longitudes.

Location Map of Union City, Alameda, California

Where is Union City Located in Alameda, California

About Map: The map shows the location of Union City in Alameda County, in the U.S. state of California.

Union City Map, California, USA

About Union City Map: This Google Map provides a detailed view with zoom, satellite, and street options to explore the area and its surroundings.

About Union City, Alameda County, California

Union City is located in Alameda County in the U.S. state of California, United States. It lies in the northern part of the state in the state of the United States within the East Bay region along the eastern shore of San Francisco Bay. The city was incorporated in 1959 and was formed through the merger of several communities including Alvarado and Decoto, and it developed from agricultural land into a diverse residential and industrial community.

Population

According to the United States Census Bureau, the population of Union City is 70,143 as recorded in the 2020 Census, and the population density is approximately 3,600 people per square mile.

Geography

According to the United States Census Bureau, Union City covers a total area of approximately 19.5 square miles (about 50.5 square kilometers), including about 19.3 square miles (50.0 square kilometers) of land and 0.2 square miles (0.5 square kilometers) of water.

Location and Surroundings

Union City is situated south of Hayward and north of Fremont, positioned between the East Bay hills and the shoreline of San Francisco Bay. The city features suburban neighborhoods, industrial areas, and access to regional parks and wetlands. Interstate 880 runs through the city, providing a major transportation route connecting Union City to Oakland, San Jose, and other Bay Area communities.

Top Attractions

Union City offers parks, community centers, and cultural events that support recreation and tourism. Popular destinations include the Alameda Creek Regional Trail, Quarry Lakes Regional Recreation Area nearby, and the Union Landing shopping district. The city hosts annual festivals and community programs that reflect its diverse population and civic engagement.

Transportation

Union City is served by Interstate 880 and State Route 238, offering convenient highway access throughout the Bay Area. Public transportation includes BART service and regional bus connections linking the city to surrounding communities. The nearest major airport is Oakland International Airport, located approximately 10 miles to the north.

Explore more cities in California or visit the United States Map section to learn more about the country’s geography.

Sources:

Population and area data sourced from the United States Census Bureau (2020 Census). General city information referenced from the Official Union City Website.

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Union City, California Quick Facts

AttributeDetails
CityUnion City
CountyAlameda County
StateCalifornia
State CapitalSacramento
US RegionWestern United States
Latitude37.5934° N
Longitude122.0439° W
ElevationApproximately 33 ft (10 m)
Land Area19.3 sq mi
Water Area0.0 sq mi
Total Area19.3 sq mi
Population (2020 Census)70,143
Population DensityApproximately 3,635 per sq mi
ZIP Codes94587
Area Code510
Time Zone StandardPacific Standard Time (PST), UTC−8
Time Zone DaylightPacific Daylight Time (PDT), UTC−7
CurrencyUnited States Dollar (USD)
FIPS Code06-81204
Community TypeCity

Transportation and Connectivity in Union City, California

TransportationDetails
Airport NameSan Francisco International Airport
IATA CodeSFO
Regional AirportOakland International Airport
PortPort of Oakland
Major HighwaysInterstate 880, State Route 238, State Route 92, Interstate 680
Train/Amtrak ServiceBay Area Rapid Transit (BART) and nearby Amtrak Capitol Corridor service
Local Transit ServiceUnion City Transit and Bay Area transit connections
  • Interstate 880 (I-880) — Major north-south freeway connecting Union City with Oakland, San Jose, and the East Bay.
  • State Route 92 — Provides access across the San Francisco Bay between the East Bay and Peninsula.
  • Interstate 680 (I-680) — Connects Union City with inland East Bay communities and the Tri-Valley region.

Top Places to Visit in Union City, California

Landmark NameType
Quarry Lakes Regional Recreation AreaRegional Park
Alameda Creek Regional TrailTrail and Recreation Area
Dry Creek Pioneer Regional ParkRegional Park
Union Landing Shopping CenterShopping Center
Union City Historical MuseumHistory Museum
Mark Green Sports CenterRecreation Facility
Seven Hills ParkPublic Park
Mission Peak Regional PreserveNatural Area
Don Edwards San Francisco Bay National Wildlife RefugeWildlife Refuge
Niles Canyon RailwayHistoric Railway Attraction

Driving Distances from Union City, California to Nearby Cities

CityStateDistance (mi)Approx. Drive Time
FremontCalifornia5 mi10 minutes
HaywardCalifornia10 mi15 minutes
San JoseCalifornia25 mi35 minutes
OaklandCalifornia25 mi35 minutes
San FranciscoCalifornia35 mi50 minutes
BerkeleyCalifornia30 mi45 minutes
Santa ClaraCalifornia20 mi30 minutes
StocktonCalifornia70 mi1 hour 20 minutes
SacramentoCalifornia95 mi1 hour 45 minutes
MontereyCalifornia80 mi1 hour 40 minutes

Colleges and Universities Near Union City, California

Institution NameTypeLevelNotable For
Ohlone CollegePublicCommunity CollegeTransfer programs, technology, health sciences, and career education
California State University, East BayPublicUniversityBusiness, education, sciences, and regional research
Stanford UniversityPrivateUniversityResearch, engineering, business, and technology programs
University of California, BerkeleyPublicUniversityResearch, engineering, sciences, and humanities
New Haven Unified School DistrictPublicK–12 DistrictLocal public education

Waterbodies Near Union City, California

San Francisco Bay, Alameda Creek, Alameda Creek Flood Control Channel, Quarry Lakes, and nearby East Bay waterways

Golf Courses and Stadiums Near Union City

Golf Courses: Alameda Creek Golf Course, Mission Hills of Hayward Golf Course, and nearby East Bay golf facilities. Stadiums: Oracle Park, Oakland Coliseum area, Levi's Stadium, and local Union City sports facilities.

Key Landmarks and Places to Visit in Union City, California

Landmark NameType
Quarry Lakes Regional Recreation AreaRegional Park
Alameda Creek Regional TrailTrail and Recreation Area
Union City Historical MuseumHistory Museum
Mark Green Sports CenterRecreation Facility
Union Landing Shopping CenterShopping Center
Dry Creek Pioneer Regional ParkRegional Park
Mission Peak Regional PreserveNatural Preserve
Don Edwards San Francisco Bay National Wildlife RefugeWildlife Refuge
Niles Canyon RailwayHistoric Railway Attraction
Ardenwood Historic FarmHistoric Farm

Union City, California — Key Historical Facts

  • Union City was incorporated in 1959 by combining the communities of Alvarado and Decoto.
  • The area has a history connected to Ohlone Native American communities, Spanish missions, agriculture, and early California settlements.
  • The historic town of Alvarado was an important agricultural and transportation center in the 19th century.
  • Union City grew rapidly after World War II as suburban development expanded throughout the San Francisco Bay Area.
  • The city became a diverse residential and employment center with strong connections to Silicon Valley and the East Bay.
  • Today, Union City is known for its multicultural community, BART connectivity, parks, technology-related industries, and location near the San Francisco Bay.

References

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