STD Rates in San Mateo County, California
2023 CDC surveillance data for San Mateo County, California — chlamydia, gonorrhea, and syphilis rates with state comparisons.
San Mateo County reported a combined STD rate of 494.9 per 100,000 residents in 2023, placing it 25th of 58 California counties — in the upper half of the state. Reported infections included chlamydia at 360.4 per 100,000 (2,618 cases, 27% below the state rate), gonorrhea at 125.3 per 100,000 (910 cases, 34% below the state rate), syphilis at 9.2 per 100,000 (67 cases, 44% below the state rate). Many STDs show no symptoms, so testing is the only reliable way to know your status. Confidential options are available across San Mateo County.
STD Trends in San Mateo County, 2000–2023
Reported cases per 100,000 residents each year, against the California rate (dashed). In a county this size a handful of cases moves the rate a long way, so read the shape rather than any single year.
Source: CDC NCHHSTP AtlasPlus county surveillance, 2000–2023.
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San Mateo County vs California and the US
| Infection | San Mateo County | California | US | vs California | vs US | Rank in California |
|---|---|---|---|---|---|---|
| Chlamydia | 360.42,618 cases | 491.1 | 490.7 | 26.6% below | 26.6% below | 26th of 58 |
| Gonorrhea | 125.3910 cases | 190.2 | 178.2 | 34.1% below | 29.7% below | 17th of 58 |
| Syphilis (P&S) | 9.267 cases | 16.3 | 15.8 | 43.6% below | 41.8% below | 41st of 58 |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among California’s counties. The US rate is all 50 states combined. Comparisons are left out where fewer than 20 cases were reported, because a rate built on so few cases can swing widely from one year to the next.
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