STD Rates in Chester County, Pennsylvania
2023 CDC surveillance data for Chester County, Pennsylvania — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Chester County reported a combined STD rate of 280.2 per 100,000 residents in 2023, placing it 31st of 67 Pennsylvania counties — in the upper half of the state. Reported infections included chlamydia at 226.5 per 100,000 (1,245 cases, 46% below the state rate), gonorrhea at 49.3 per 100,000 (271 cases, 66% below the state rate), syphilis at 4.4 per 100,000 (24 cases, 52% 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 Chester County.
STD Trends in Chester County, 2000–2023
Reported cases per 100,000 residents each year, against the Pennsylvania 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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Chester County vs Pennsylvania and the US
| Infection | Chester County | Pennsylvania | US | vs Pennsylvania | vs US | Rank in Pennsylvania |
|---|---|---|---|---|---|---|
| Chlamydia | 226.51,245 cases | 421.2 | 490.7 | 46.2% below | 53.8% below | 32nd of 67 |
| Gonorrhea | 49.3271 cases | 144.7 | 178.2 | 65.9% below | 72.3% below | 25th of 67 |
| Syphilis (P&S) | 4.424 cases | 9.1 | 15.8 | 51.6% below | 72.2% below | 25th of 67 |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Pennsylvania’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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