Cities in Alameda County, California by Population (2024)

There are 26 cities in Alameda County, California.

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

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City
2024 Population
San Francisco746,481
Oakland420,233
Fremont217,548
Hayward150,906
Berkeley113,694
Tracy101,243
San Leandro82,817
Livermore81,522
Alameda74,036
Pleasanton73,702
Dublin71,596
Castro Valley66,496
Union City64,093
Newark47,012
San Lorenzo29,401
Mountain House24,506
Ashland22,762
Albany18,605
Cherryland15,393
Discovery Bay14,820
Emeryville12,887
Piedmont10,371
Fairview10,332
Kensington5,351
Byron1,779
Sunol1,005
showing: 26 rows

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Alameda County, California?

San Francisco is the largest city in Alameda County.

What is the smallest city in Alameda County, California?

Sunol is the smallest city in Alameda County.

How many cities are in Alameda County?

There are 26 cities in Alameda County, California.

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