San Mateo County voter turnout
How many people does one vote speak for in San Mateo County, California?
Only 50% of eligible citizens in San Mateo County voted in the 2022 midterm.
2024 presidential: 67% turnout · 1.5 people per vote
Turnout in San Mateo County
In the November 2022 midterm, 247,517 of San Mateo County’s 494,554 eligible citizens voted: 50.0% turnout. That’s 8.1 points higher than California overall (41.9%) and 4.0 points higher than the national rate (46.0%). With 247,037 eligible citizens sitting it out, each ballot cast spoke for 2.0 people.
In the 2024 presidential election, turnout was 66.8%, so each ballot spoke for 1.5 people. Midterm turnout here ran 16.8 points below the presidential year, which is why every vote in a midterm like 2026 carries extra weight.
San Mateo County ranks #41 of 58 counties in California for vote power (#1 has the lowest turnout, so each vote there counts for the most people).
Election Day is Tuesday, November 3, 2026 — register or check your status at vote.org.
| County | Rank | Turnout | Per vote |
|---|---|---|---|
| San Francisco County | #38 | 49.0% | 2.0 |
| Ventura County | #39 | 49.0% | 2.0 |
| Shasta County | #40 | 49.6% | 2.0 |
| San Mateo County | #41 | 50.0% | 2.0 |
| Modoc County | #42 | 51.6% | 1.9 |
| Napa County | #43 | 52.2% | 1.9 |
| Siskiyou County | #44 | 52.3% | 1.9 |
See all 58 California counties ranked →