STD Rates in Marin County, California
2023 CDC surveillance data for Marin County, California — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Marin County recorded a combined STD rate of 396.6 per 100,000 residents in 2023, ranking 39th of 58 counties in California. Reported infections included chlamydia at 294.4 per 100,000 (749 cases, 40% below the state rate), gonorrhea at 97.1 per 100,000 (247 cases, 49% below the state rate), syphilis at 5.1 per 100,000 (13 cases, too few for a reliable comparison). Confidential STD testing is available throughout Marin County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Marin 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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Marin County vs California and the US
| Infection | Marin County | California | US | vs California | vs US | Rank in California |
|---|---|---|---|---|---|---|
| Chlamydia | 294.4749 cases | 491.1 | 490.7 | 40.1% below | 40% below | 38th of 58 |
| Gonorrhea | 97.1247 cases | 190.2 | 178.2 | 48.9% below | 45.5% below | 29th of 58 |
| Syphilis (P&S) | 5.113 cases | 16.3 | 15.8 | Too few cases | Too few cases | – |
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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