As Johnson won nationally in a massive landslide, taking 61.05% of the vote nationwide, and dominating many Northeastern and Midwestern states by record landslide margins, California weighed in as about 4% more Republican than the national average in the 1964 election. Johnson dominated in liberal Northern California, breaking 60% in many counties and even breaking 70% in Plumas County and the city of San Francisco. However, the Western conservative Goldwater, from neighboring Arizona, appealed to residents of conservative Southern California, where Johnson failed to break his nationwide vote average in a single county. Goldwater indeed won six congressional districts in suburban areas of Los Angeles, Orange, and San Diego counties, and carried two heavily populated Southern California counties outright: Orange County and San Diego County, thus holding Johnson below the 60% mark statewide.
This was the last election in which California did not register the most votes cast by state. This was also Barry Goldwater's best state in a now modern day "blue wall", which were states won by the Democrats in every presidential election from 1992 to 2016. Johnson was the only Democrat besides the Democrats from 1992 to 2012 to carry all of the states of that future "blue wall".