California Population By County in 2020

Based on the US Census Vintage data estimates, in 2020, the population of California was 39,501,653. Among all California counties, Los Angeles[object Promise] had the highest population (9,992,236), followed by San Diego[object Promise] (3,296,045), and Orange[object Promise] (3,185,516). Alpine[object Promise] was the least populated county (1,204).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.