STD Rates in Cook County, Illinois
2023 CDC surveillance data for Cook County, Illinois — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Cook County has one of the higher STD burdens in Illinois, with a combined rate of 1,127.1 per 100,000 residents in 2023 — ranking 6th of 102 counties. Reported infections included chlamydia at 790.0 per 100,000 (40,189 cases, 42% above the state rate), gonorrhea at 319.7 per 100,000 (16,265 cases, 58% above the state rate), syphilis at 17.4 per 100,000 (884 cases, 50% above the state rate). Confidential STD testing is available throughout Cook County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Cook 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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Cook County vs Illinois and the US
| Infection | Cook County | Illinois | US | vs Illinois | vs US | Rank in Illinois |
|---|---|---|---|---|---|---|
| Chlamydia | 79040,189 cases | 557.7 | 490.7 | 41.7% above | 61% above | 5th of 102 |
| Gonorrhea | 319.716,265 cases | 202.3 | 178.2 | 58% above | 79.4% above | 7th of 102 |
| Syphilis (P&S) | 17.4884 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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