STD Rates in Winnebago County, Illinois
2023 CDC surveillance data for Winnebago County, Illinois — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Winnebago County has one of the higher STD burdens in Illinois, with a combined rate of 843.2 per 100,000 residents in 2023 — ranking 12th of 102 counties. Reported infections included chlamydia at 673.1 per 100,000 (1,891 cases, 21% above the state rate), gonorrhea at 152.7 per 100,000 (429 cases, 25% below the state rate), syphilis at 17.4 per 100,000 (49 cases, 50% above the state rate). Confidential STD testing is available throughout Winnebago County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Winnebago County, 2000–2023
Reported cases per 100,000 residents each year, against the Illinois 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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Winnebago County vs Illinois and the US
| Infection | Winnebago County | Illinois | US | vs Illinois | vs US | Rank in Illinois |
|---|---|---|---|---|---|---|
| Chlamydia | 673.11,891 cases | 557.7 | 490.7 | 20.7% above | 37.2% above | 10th of 102 |
| Gonorrhea | 152.7429 cases | 202.3 | 178.2 | 24.5% below | 14.3% below | 21st of 102 |
| Syphilis (P&S) | 17.449 cases | 11.6 | 15.8 | 50% above | 10.1% above | 14th of 102 |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Illinois’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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