California Population 2020. Not surprisingly, california 's los angeles county is the largest county in the state, as well as the nation, with a huge population of 10,150,558 that. The golden state’s population was 39,538,223 in 2020, a 6.1% increase since 2010 but slower than its 10% gain in the previous decade.

The population of all cities, towns and unincorporated places in california with more than 20,000 inhabitants according to census results and latest official estimates. California has a land area of 155,812.8 square miles and a water area of 7,837.9 square miles.