Alameda County, California Zip Codes
📍 Alameda County has 73 zip codes with a population of 1,681,259.
Alameda County is located in California with a land area of 830 square miles. The county seat is Oakland. Below you'll find all 73 zip codes in Alameda County with population, income and home value, the county's affordability profile, and links to its 17 city pages.
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 Alameda County Zip Codes
Alameda County at a Glance
Alameda County has 73 ZIP codes in this directory: 49 standard delivery ZIPs and 24 PO Box or unique ZIPs that carry no resident population in Census data. The 47 ZIPs with published Census housing data cover 1,681,259 residents, the largest being 94544 (Hayward) with 77,712 people.
The median ZIP in Alameda County has a household income of $125,410 and a home value of $1,061,400, a price-to-income ratio of 7.9, above the 6.7 California ZIP median. Affordability ranges from 95391 in Tracy at a ratio of 4.4 to 94705 in Berkeley, where the median home is $1,746,900. The highest median income is in 94539 (Fremont) at $219,913. Median rent across these ZIPs is $2,239 a month.
60% of households in the typical Alameda County ZIP own their home (statewide ZIP median 64%). 57% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 7.6%, below the 10.8% statewide ZIP median. Overall density is about 2,026 residents per square mile across 830 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.
Alameda County Zip Code Map
Interactive map of Alameda County, California zip codes.