County record · FIPS 06081
San Mateo County, CA
A joined view of reported 2024 election administration and the 2020–2024 American Community Survey profile for California.
Population742,340ACS 2020–2024
Registered voters471,083100% jurisdiction coverage
Voters336,922100% jurisdiction coverage
Registered turnout71.52%Reported voters / registration
Ballot administration
Mail-ballot record
| Stage | Reported ballots | Jurisdiction coverage |
|---|---|---|
| Transmitted | 450,907 | 100% |
| Returned | 296,724 | 100% |
| Counted | 294,540 | 100% |
| Rejected | 2,184 | 100% |
Return rate65.81%
Rejection rate0.74%
A blank means the source did not provide enough information. It does not mean zero ballots.
Administrative capacity
Election infrastructure
Polling places49100% coverage
Poll workers523100% coverage
Drop boxes64100% coverage
Provisional ballots cast4,960100% coverage
Provisional acceptance95.38%Counted / cast where reported
Cross-state twin
San Mateo County, CA ↔ Bergen County, NJ
67.0% profile similarityPopulation742,340962,316
Median household income$158,855$124,884
Poverty6.71%6.79%
No vehicle5.76%7.48%
The closest profile among counties in other states. Similarity uses seven ACS measures and does not include vote choice.
Reported detail
Mail rejection reasons
| Reason | Ballots |
|---|---|
| Signature mismatch | 1,038 |
| Late | 866 |
| Missing signature | 140 |
| Missing documentation | 70 |
| Already voted | 8 |
| Deceased | 7 |