Cities

Alameda County, California, has 14 incorporated cities, ranging in population from Oakland to Piedmont. The table below lists these cities from largest to smallest using the California Department of Finance’s population estimates for January 1, 2026.

Cities in Alameda County by Population

The figures are provisional population estimates published in May 2026.

City	Population — January 1, 2026
Oakland	429,591
Fremont	233,974
Hayward	161,557
Berkeley	127,654
San Leandro	87,431
Livermore	86,118
Alameda	80,023
Pleasanton	76,149
Dublin	74,769
Union City	66,665
Newark	48,962
Albany	20,564
Emeryville	13,612
Piedmont	10,802

Source: California Department of Finance, E-1 Population Estimates for Cities, Counties, and the State, January 1, 2025 and 2026, published May 2026. These figures are estimates rather than census counts.

Largest Cities: Oakland, Fremont, Hayward, and Berkeley

Oakland is the county’s largest city, with approximately 430,000 residents. Fremont ranks second, followed by Hayward and Berkeley. These four cities are the only incorporated cities in Alameda County with populations above 100,000 in this estimate.

Cities With 40,000 to 90,000 Residents

Seven cities have between 40,000 and 90,000 residents: San Leandro, Livermore, Alameda, Pleasanton, Dublin, Union City, and Newark. San Leandro and Livermore are the largest cities in this group, followed by Alameda. Pleasanton and Dublin have similar population totals, while Union City and Newark have smaller populations.

Smallest Cities: Albany, Emeryville, and Piedmont

Albany, Emeryville, and Piedmont are the county’s three smallest incorporated cities by population. Albany has just over 20,000 residents, Emeryville has approximately 13,600, and Piedmont has approximately 10,800.