California Population By County in 2018

Based on the US Census Vintage data estimates, in 2018, the population of California was 39,437,463. Among all California counties, Los Angeles[object Promise] had the highest population (10,061,533), followed by San Diego[object Promise] (3,332,483), and Orange[object Promise] (3,175,579). Alpine[object Promise] was the least populated county (1,081).

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.