STD Rates in Mchenry County, Illinois
2023 CDC surveillance data for Mchenry County, Illinois — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Mchenry County is among the lower-burden counties in Illinois, reporting a combined STD rate of 233.3 per 100,000 residents in 2023 — 77th of 102 counties. Reported infections included chlamydia at 203.0 per 100,000 (635 cases, 64% below the state rate), gonorrhea at 26.5 per 100,000 (83 cases, 87% below the state rate), syphilis at 3.8 per 100,000 (12 cases, too few for a reliable comparison). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Mchenry County has confidential testing locations available.
STD Trends in Mchenry 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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Mchenry County vs Illinois and the US
| Infection | Mchenry County | Illinois | US | vs Illinois | vs US | Rank in Illinois |
|---|---|---|---|---|---|---|
| Chlamydia | 203635 cases | 557.7 | 490.7 | 63.6% below | 58.6% below | 73rd of 102 |
| Gonorrhea | 26.583 cases | 202.3 | 178.2 | 86.9% below | 85.1% below | 92nd of 102 |
| Syphilis (P&S) | 3.812 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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