STD Rates in Sonoma County, California
2023 CDC surveillance data for Sonoma County, California — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Sonoma County reported a combined STD rate of 480.9 per 100,000 residents in 2023, placing it 28th of 58 California counties — in the upper half of the state. Reported infections included chlamydia at 362.6 per 100,000 (1,747 cases, 26% below the state rate), gonorrhea at 103.4 per 100,000 (498 cases, 46% below the state rate), syphilis at 14.9 per 100,000 (72 cases, 9% 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 Sonoma County.
STD Trends in Sonoma 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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Sonoma County vs California and the US
| Infection | Sonoma County | California | US | vs California | vs US | Rank in California |
|---|---|---|---|---|---|---|
| Chlamydia | 362.61,747 cases | 491.1 | 490.7 | 26.2% below | 26.1% below | 25th of 58 |
| Gonorrhea | 103.4498 cases | 190.2 | 178.2 | 45.6% below | 42% below | 26th of 58 |
| Syphilis (P&S) | 14.972 cases | 16.3 | 15.8 | 8.6% below | 5.7% below | 22nd 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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