California Population By County in 2017

Based on the US Census Vintage data estimates, in 2017, the population of California was 39,337,785. Among all California counties, Los Angeles[object Promise] had the highest population (10,092,365), followed by San Diego[object Promise] (3,319,019), and Orange[object Promise] (3,174,159). Alpine[object Promise] was the least populated county (1,116).

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.