STD Rates in Merced County, California
2023 CDC surveillance data for Merced County, California — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Merced County reported a combined STD rate of 620.7 per 100,000 residents in 2023, placing it 16th of 58 California counties — in the upper half of the state. Reported infections included chlamydia at 498.1 per 100,000 (1,454 cases, 1% above the state rate), gonorrhea at 108.2 per 100,000 (316 cases, 43% below the state rate), syphilis at 14.4 per 100,000 (42 cases, 12% 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 Merced County.
STD Trends in Merced 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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Merced County vs California and the US
| Infection | Merced County | California | US | vs California | vs US | Rank in California |
|---|---|---|---|---|---|---|
| Chlamydia | 498.11,454 cases | 491.1 | 490.7 | 1.4% above | 1.5% above | 11th of 58 |
| Gonorrhea | 108.2316 cases | 190.2 | 178.2 | 43.1% below | 39.3% below | 24th of 58 |
| Syphilis (P&S) | 14.442 cases | 16.3 | 15.8 | 11.7% below | 8.9% below | 24th 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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