Alameda County, CA ZIP Codes & Directory
Complete postal guide for Alameda County, California. Featuring the official county seat of Oakland, largest municipality Oakland, and serving 16 incorporated municipal entities.
Municipalities Located in Alameda County
Incorporated Cities, Towns, and Villages
Alameda
cityZIPs: 94501, 94502
Albany
cityZIPs: 94706
Berkeley
cityZIPs: 94702, 94703 , +6 more
Castro Valley
cityZIPs: 94546, 94552
Dublin
cityZIPs: 94568
Emeryville
cityZIPs: 94608
Fremont
cityZIPs: 94536, 94538 , +2 more
Hayward
cityZIPs: 94541, 94542 , +2 more
Livermore
cityZIPs: 94550, 94551
Newark
cityZIPs: 94560
Oakland
cityZIPs: 94601, 94602 , +13 more
Pleasanton
cityZIPs: 94566, 94588
San Leandro
cityZIPs: 94577, 94578 , +1 more
San Lorenzo
cityZIPs: 94580
Sunol
cityZIPs: 94586
Union City
cityZIPs: 94587
Active USPS ZIP Codes in Alameda County
Standard delivery zones and geographic service boundaries
Frequently Asked Questions About Alameda County, CA
What is the county seat and largest city in Alameda County? ▾
The official county seat of Alameda County is Oakland, and its largest incorporated municipality by population is Oakland.
How many cities, towns, and villages are in Alameda County? ▾
Alameda County encompasses 16 incorporated municipal entities, including 16 cities, 0 towns, and 0 villages.
What is the total population and land area of Alameda County? ▾
According to official U.S. Census Bureau data, Alameda County has a population of approximately 1,682,353 residents and spans an area of 739 square miles.
How many ZIP codes operate in Alameda County? ▾
There are 49 active USPS ZIP codes serving addresses within Alameda County, California.