Castro Valley, California Zip Codes
📍 Castro Valley is in Alameda County, California with 2 zip codes; the most populous is 94546.
Castro Valley is a USPS city name in Alameda County, California with a Census population of approximately 60,709 across its ZIP codes. Alameda County as a whole has 73 ZIP codes in this directory. Below you'll find every zip code serving Castro Valley with population, income and home value, a map, and the city's affordability profile.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Castro Valley Zip Codes
Castro Valley at a Glance
Castro Valley has 2 ZIP codes in this directory: 2 standard delivery ZIPs. The 2 ZIPs with published Census housing data cover 60,709 residents, the largest being 94546 with 45,761 people.
The median ZIP in Castro Valley has a household income of $161,034 and a home value of $1,082,200, a price-to-income ratio of 7.0, in line with the 6.7 California ZIP median. The highest median income is in 94552 at $204,260. Median rent across these ZIPs is $2,936 a month.
79% of households in the typical Castro Valley ZIP own their home (statewide ZIP median 64%). 50% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 6.3%, below the 10.8% statewide ZIP median. Overall density is about 895 residents per square mile across 68 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 California ZIP Code Affordability Report.
Castro Valley Zip Code Map
Interactive map of Castro Valley, California zip codes. Click any marker for details.