There was an increase of about 44% for Democratic voters from 2016 to 2025 and an increase of about 11 percent for Republican voters in Santa Clara County. The total voters increased by 273,994 , Democrats increased by 163,003 and Republicans increased by 18,102.

According to CA Secretary of State website’s PDF file of Report of Registration as of February 10, 2025 Registration by County https://elections.cdn.sos.ca.gov/…/county.pdf there are 1,062,057 total voters in Santa Clara County.

According to CA Secretary of State website’s PDF file of Report of Registration as of May 23, 2016 Registration by County https://elections.cdn.sos.ca.gov/…/county.pdf there were 788,063 total voters in Santa Clara County.