STD Rates in Contra Costa County, California
2023 CDC surveillance data for Contra Costa County, California — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Contra Costa County reported a combined STD rate of 568.8 per 100,000 residents in 2023, placing it 18th of 58 California counties — in the upper half of the state. Reported infections included chlamydia at 427.7 per 100,000 (4,940 cases, 13% below the state rate), gonorrhea at 127.9 per 100,000 (1,477 cases, 33% below the state rate), syphilis at 13.2 per 100,000 (153 cases, 19% below the state rate). Confidential STD testing is available throughout Contra Costa County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Contra Costa 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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Contra Costa County vs California and the US
| Infection | Contra Costa County | California | US | vs California | vs US | Rank in California |
|---|---|---|---|---|---|---|
| Chlamydia | 427.74,940 cases | 491.1 | 490.7 | 12.9% below | 12.8% below | 19th of 58 |
| Gonorrhea | 127.91,477 cases | 190.2 | 178.2 | 32.8% below | 28.2% below | 15th of 58 |
| Syphilis (P&S) | 13.2153 cases | 16.3 | 15.8 | 19% below | 16.5% below | 29th 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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