STD Rates in Delaware County, Pennsylvania
2023 CDC surveillance data for Delaware County, Pennsylvania — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Delaware County has one of the higher STD burdens in Pennsylvania, with a combined rate of 755.3 per 100,000 residents in 2023 — ranking 3rd of 67 counties. Reported infections included chlamydia at 556.4 per 100,000 (3,209 cases, 32% above the state rate), gonorrhea at 188.0 per 100,000 (1,084 cases, 30% above the state rate), syphilis at 10.9 per 100,000 (63 cases, 20% above the state rate). Confidential STD testing is available throughout Delaware County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Delaware 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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Delaware County vs Pennsylvania and the US
| Infection | Delaware County | Pennsylvania | US | vs Pennsylvania | vs US | Rank in Pennsylvania |
|---|---|---|---|---|---|---|
| Chlamydia | 556.43,209 cases | 421.2 | 490.7 | 32.1% above | 13.4% above | 4th of 67 |
| Gonorrhea | 1881,084 cases | 144.7 | 178.2 | 29.9% above | 5.5% above | 4th of 67 |
| Syphilis (P&S) | 10.963 cases | 9.1 | 15.8 | 19.8% above | 31% below | 6th 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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