Voting & Elections in Foster City, CA
Presidential election results and party lean trends
County-level data: Election results are reported at the county level. Foster City is located in San Mateo County, CA. Results reflect all voters in the county, not just those in Foster City.
Election Overview
Source: San Mateo County (2024)2024 Winner
Democrat
Dem Votes
242,957
73.5%
GOP Votes
76,616
23.2%
Total Votes
330,510
Margin
D+50.3%
Shift from 2020
R+7.4pp
vs prior election
📊Election Results by Year
2016–2024📈Partisan Lean Trend
D+50.3%Election History
Source: County-Level Election Results| Year | Dem Votes | GOP Votes | Total | Dem % | GOP % | Margin |
|---|---|---|---|---|---|---|
| 2024 | 242,957 | 76,616 | 330,510 | 73.5% | 23.2% | D+50.3 |
| 2020 | 291,410 | 75,563 | 374,138 | 77.9% | 20.2% | D+57.7 |
| 2016 | 219,580 | 53,731 | 287,499 | 76.4% | 18.7% | D+57.7 |
In the 2024 presidential election, San Mateo County recorded 330,510 total votes. Democrats won the county with 73.5% of the vote compared to 23.2% for Republicans, a margin of D+50.3%. Compared to 2020, the margin shifted R+7.4pp from the previous election. Since 2016, San Mateo County has shifted 7.4 percentage points toward Republicans.