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
Rank
State
2024 Population
2020 Census
Annual Change
Density (mi²)
Area (mi²)
San Francisco1California746,481870,393-3.98%15,98546.70
Oakland2California420,233440,873-1.21%7,50955.96
Fremont3California217,548230,194-1.43%2,78578.10
Hayward4California150,906162,602-1.9%3,29445.82
Berkeley5California113,694124,206-2.26%10,89910.43
Tracy6California101,24393,4131.97%3,84426.34
San Leandro7California82,81790,707-2.33%6,21613.32
Livermore8California81,52287,880-1.91%3,06826.57
Alameda9California74,03678,044-1.33%7,12010.40
Pleasanton10California73,70279,676-1.99%3,05324.14
Dublin11California71,59672,524-0.32%4,70115.23
Castro Valley12California66,49664,3920.8%3,94716.85
Union City13California64,09369,985-2.25%3,30419.40
Newark14California47,01247,612-0.32%3,37813.92
San Lorenzo15California29,40130,117-0.6%9,6523.05
Mountain House16California24,50621,3871.91%5,3764.56
Ashland17California22,76223,566-0.88%12,3511.84
Albany18California18,60520,225-2.13%10,3941.79
Cherryland19California15,39315,976-0.34%12,9031.19
Discovery Bay20California14,82015,904-1.8%2,6505.59
Emeryville21California12,88712,939-0.1%10,1231.27
Piedmont22California10,37111,251-2.08%6,1011.70
Fairview23California10,33210,834-1.2%3,4742.97
Kensington24California5,3515,1710.39%5,5510.96
Byron25California1,7792,057-3.73%2736.52
Sunol26California1,0058354.47%3628.26
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.

Frequently Asked Questions