STD Rates in Alameda County, California
2023 CDC surveillance data for Alameda County, California — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Alameda County has one of the higher STD burdens in California, with a combined rate of 663.7 per 100,000 residents in 2023 — ranking 12th of 58 counties. Reported infections included chlamydia at 453.4 per 100,000 (7,355 cases, 8% below the state rate), gonorrhea at 198.8 per 100,000 (3,225 cases, 5% above the state rate), syphilis at 11.5 per 100,000 (186 cases, 29% below the state rate). Confidential STD testing is available throughout Alameda County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Alameda 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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Alameda County vs California and the US
| Infection | Alameda County | California | US | vs California | vs US | Rank in California |
|---|---|---|---|---|---|---|
| Chlamydia | 453.47,355 cases | 491.1 | 490.7 | 7.7% below | 7.6% below | 17th of 58 |
| Gonorrhea | 198.83,225 cases | 190.2 | 178.2 | 4.5% above | 11.6% above | 5th of 58 |
| Syphilis (P&S) | 11.5186 cases | 16.3 | 15.8 | 29.4% below | 27.2% below | 35th 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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