Alameda County, California ZIP Codes

49 ZIP Codes

Zip Code
City
Population ↓
94544Hayward76,947
94568Dublin70,803
94536Fremont70,619
94538Fremont67,781
94587Union City67,464
94541Hayward67,139
94501Alameda63,808
94601Oakland53,259
94539Fremont52,396
94550Livermore49,873
94560Newark46,903
94577San Leandro46,317
94546Castro Valley44,855
94566Pleasanton44,222
94605Oakland44,103
94578San Leandro41,769
94611Oakland40,116
94606Oakland39,966
94551Livermore37,885
94555Fremont37,501
94603Oakland35,742
94608Emeryville34,395
94588Pleasanton34,328
94621Oakland33,840
94545Hayward32,843
94610Oakland32,628
94602Oakland31,759
94580San Lorenzo29,420
94607Oakland28,804
94619Oakland26,831
95391Tracy25,574
94609Oakland23,928
94704Berkeley23,788
94703Berkeley20,934
94579San Leandro20,017
94706Albany19,969
94612Oakland18,175
94702Berkeley17,635
94618Oakland16,958
94542Hayward14,871
94552Castro Valley14,506
94705Berkeley13,991
94502Alameda13,430
94707Berkeley12,811
94709Berkeley12,146
94710Berkeley8,380
94720Berkeley5,763
94586Sunol971
94613Oakland472

Overview of ZIP Codes in Alameda County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
49
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 49 ZCTAs in Alameda County, California (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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