A head to head comparison of the California 2020 General Election gives us an idea of the break down of the voters.      

VP Joseph Biden received 10,270,877 (66%) votes beating President Donald Trump who gained 5,370,182 (34%) by 4,900,695 votes in California.

VP Joe Biden won 36 counties out of the 58 counties that make up California. The record shows that President Trump won 22 counties.  

2020 CA Primary Election vs Presidential General Elections Counties Won              

Primary Elections

Presidential General Election

Primary Election

In the Primary, President Trump won 45 counties in a 3 way match up. Senator Sanders trailed behind him winning 11 counties, with VP Biden only winning 2 in California Primary.

2020 CA Presidential Primary vs Presidential General Elections w.r.t % Votes and Total Votes Won        

Presidential Primary Elections

Presidential Election

On a head to head count with the total votes between in VP Biden and President Trump between the Presidential Primary and General Elections, percentage (%) vote shift difference is a 25% increase for VP Biden and a 25% decrease for President Trump. These percentages are represented by a vote increment of 8,657,297 for Biden and 3,091,112 for Trump at the Presidential General Elections.

Presidential Primary Elections

Presidential General Elections

During the 2020 General elections, a lot of total number of votes were cast. Aside the Electoral Votes, Popular Votes came to the fore as well. Further details regarding overall total votes cast, percentage contributed by the various states, and the winner of Popular votes will be updated soon.

Top 15 Counties in Presidential Primary Elections vs Presidential General Elections

All Candidates (Presidential Primary Elections)

All Candidates (Presidential General Elections)

Primary Elections vs General Elections

These 15 counties play an important role in these primary elections. If a candidate, can get a sizable majority in the larger counties (Los Angeles, Orange and San Diego), it becomes very difficult to win majorities in the smaller counties with out voter out reach and increased voter participation in them.

Top 15 Counties Comparison in Primary Elections vs General Elections

Presidential Primary Elections
VP Joseph Biden

Presidential Primary Elections
President Donald Trump

Presidential General Elections
VP Joseph Biden

Presidential General Elections
President Donald Trump

Los Angeles, Orange and San Diego, three of the larger counties in California voted in favor of VP Joseph Biden giving him a 2.3 Million vote advantage out of those counties. This combined with Biden's steady win at many other counties, made him gain an upper hand in the State of California.

Related References: 2020 California Primary Election Story, 2016 California Primary Election Story, 2012 California Primary Election Story