STD Rates in Williamson County, Illinois
2023 CDC surveillance data for Williamson County, Illinois — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Williamson County has one of the higher STD burdens in Illinois, with a combined rate of 581.6 per 100,000 residents in 2023 — ranking 21st of 102 counties. Reported infections included chlamydia at 424.2 per 100,000 (283 cases, 24% below the state rate), gonorrhea at 133.4 per 100,000 (89 cases, 34% below the state rate), syphilis at 24.0 per 100,000 (16 cases, too few for a reliable comparison). Confidential STD testing is available throughout Williamson County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Williamson 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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Williamson County vs Illinois and the US
| Infection | Williamson County | Illinois | US | vs Illinois | vs US | Rank in Illinois |
|---|---|---|---|---|---|---|
| Chlamydia | 424.2283 cases | 557.7 | 490.7 | 23.9% below | 13.6% below | 22nd of 102 |
| Gonorrhea | 133.489 cases | 202.3 | 178.2 | 34.1% below | 25.1% below | 24th of 102 |
| Syphilis (P&S) | 2416 cases | 11.6 | 15.8 | Too few cases | Too few cases | – |
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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