California Citizen Population By County in 2018 (ACS-5Yrs)

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen population for California was 33,964,450 and represented 86.76% of the total California population.

Among all California counties, Los Angeles had the highest citizen population (8.43M), followed by San Diego (2.94M), and Orange (2.72M).

In terms of percentages, Alpine had the highest percentage of its population being citizens (99.13%), followed by Sierra (98.64%), and Tuolumne (98.54%).

The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.

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