Castro Valley is a community in Alameda County, California, home to about 65,001 people across 17 square miles. Its ZIP codes are 94546 and 94552, and parts of 94578 are in Castro Valley too.
Homes sold for a median of $713 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Castro Valley
Mostly Castro Valley; also Union City and Hayward
Mostly San Leandro; part is in Castro Valley
Each card is that ZIP code’s whole market, including any part outside Castro Valley. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Castro Valley’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)9 miles away |
|---|---|
| Nearest city of 250,000+ | Oakland, CA10 miles away |
| Nearest city of 1 million+ | Los Angeles, CA327 miles away |
Straight-line distances from the center of Castro Valley; 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.
Castro Valley had 66,441 residents in the 2020 census, up 16% since 2000.
It’s the 141st 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 (5 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).
649 doctors and other health care providers list an office in Castro Valley’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 62 |
|---|---|
| Specialist doctors | 174 |
| Dentists | 61 |
| Nurse practitioners and physician assistants | 67 |
| Mental health providers | 150 |
| Physical and occupational therapists | 73 |
| Optometrists | 24 |
| Chiropractors | 38 |
| Pharmacies | 6 |
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 (26 nearby)
Grocery stores (11 nearby)
Pharmacies (3 nearby)
Libraries (2 nearby)
Museums (2 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 Castro Valley Unified. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Castro Valley ElementaryCastro Valley | K–5 | 502 | Public | 1.2 mi |
| Castro Valley Virtual AcademyCastro Valley | K–12 | 45 | Public | 1.7 mi |
| Chabot ElementaryCastro Valley | K–5 | 496 | Public | 1.4 mi |
| Independent ElementaryCastro Valley | K–5 | 662 | Public | 0.9 mi |
| Jensen Ranch ElementaryCastro Valley | K–5 | 373 | Public | 1.8 mi |
| Marshall ElementaryCastro Valley | K–5 | 515 | Public | 0.6 mi |
| Palomares ElementaryCastro Valley | K–5 | 135 | Public | 2.3 mi |
| Proctor ElementaryCastro Valley | K–5 | 613 | Public | 0.8 mi |
| Stanton ElementaryCastro Valley | K–5 | 515 | Public | 1.7 mi |
| Vannoy ElementaryCastro Valley | K–5 | 536 | Public | 0.2 mi |
| Canyon MiddleCastro Valley | 6–8 | 1,418 | Public | 0.6 mi |
| Creekside MiddleCastro Valley | 6–8 | 754 | Public | 0.6 mi |
| Castro Valley HighCastro Valley | 9–12 | 2,874 | Public | 0.8 mi |
| Redwood Continuation HighCastro Valley | 9–12 | 92 | Alternative Education | 1.7 mi |
| Roy A. Johnson HighCastro Valley | 9–12 | 18 | Special Education | 1.7 mi |
| Alma PreschoolCastro Valley | — | — | Public | 0.5 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| The Montessori Giving TreeCastro Valley | Pre-K–10 | 12 | Nonsectarian | 1.9 mi |
| Mission Hills SchoolCastro Valley | TK–5 | 126 | Nonsectarian | 2.0 mi |
| Our Lady of Grace Catholic SchoolCastro Valley | TK–8 | 166 | Roman Catholic | 1.2 mi |
| Redwood Christian Elementary SchoolCastro Valley | TK–5 | 268 | Christian (no specific denomination) | 0.6 mi |
| Anchor Education, Inc. Dba One School Global-San FCastro Valley | 3–11 | 30 | Christian (no specific denomination) | 1.4 mi |
| One School Global-San Francisco CampusCastro Valley | 3–11 | 30 | Nonsectarian | 1.4 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 Union City, San Leandro, Ashland, 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.