Union City is a city in Alameda County, California, home to about 67,464 people across 19 square miles. Its ZIP code is 94587, and parts of 94552 are in Union City too.
Homes sold for a median of $729 per square foot in the three months ending August 2026, a seller’s market.
Mostly Union City; also Hayward
Mostly Castro Valley; part is in Union City
Each card is that ZIP code’s whole market, including any part outside Union City. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Union City’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Oakland San Francisco Bay Airport (OAK)11 miles away |
|---|---|
| Nearest city of 250,000+ | Oakland, CA14 miles away |
| Nearest city of 1 million+ | Los Angeles, CA322 miles away |
Straight-line distances from the center of Union City; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Union City had 70,143 residents in the 2020 census, up 5% since 2000.
It’s the 136th largest of 1,563 towns in California by population.
Alameda County grew from 130,197 residents in 1900 to 1,682,353 in 2020.
Alameda County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 77°F in summer, and winter lows average 43°F. About 16.1 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Hayward Air Terminal, CA weather station (4 miles away).
749,124 jobs at 42,318 businesses in Alameda County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
552 doctors and other health care providers list an office in Union City.
Nearest hospitals
Providers with an office here
| Primary care doctors | 77 |
|---|---|
| Specialist doctors | 70 |
| Dentists | 83 |
| Nurse practitioners and physician assistants | 40 |
| Mental health providers | 149 |
| Physical and occupational therapists | 92 |
| Optometrists | 25 |
| Chiropractors | 16 |
| Pharmacies | 12 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (58 nearby)
Grocery stores (7 nearby)
Pharmacies (2 nearby)
Libraries (3 nearby)
Museums (1 nearby)
Theaters and performance venues (3 nearby)
Counts are within about 3 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by New Haven Unified, Connecting Waters Charter - East Bay District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Alvarado ElementaryUnion City | K–5 | 667 | Public | 3.1 mi |
| Connecting Waters Charter - East BayUnion City | K–12 | 540 | Charter | 2.3 mi |
| Decoto School for Independent StudyUnion City | K–12 | 233 | Alternative Education | 2.0 mi |
| Delaine Eastin ElementaryUnion City | K–5 | 668 | Public | 4.8 mi |
| Guy Jr. Emanuele ElementaryUnion City | K–5 | 746 | Public | 2.8 mi |
| Pioneer ElementaryUnion City | K–5 | 623 | Public | 4.4 mi |
| Searles ElementaryUnion City | K–5 | 712 | Public | 2.7 mi |
| Tom Kitayama ElementaryUnion City | K–5 | 653 | Public | 2.4 mi |
| Cesar Chavez MiddleUnion City | 6–8 | 990 | Public | 2.9 mi |
| Itliong-Vera CruzUnion City | 6–8 | 1,097 | Public | 3.1 mi |
| James Logan HighUnion City | 9–12 | 3,096 | Public | 3.1 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Mission Hills Middle SchoolUnion City | TK–8 | 435 | Nonsectarian | 2.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Castro Valley, Hayward and Fremont.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.