STD Rates in Boone County, Illinois
2023 CDC surveillance data for Boone County, Illinois — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Boone County reported a combined STD rate of 342.0 per 100,000 residents in 2023, placing it 47th of 102 Illinois counties — in the upper half of the state. Reported infections included chlamydia at 300.7 per 100,000 (160 cases, 46% below the state rate), gonorrhea at 33.8 per 100,000 (18 cases, too few for a reliable comparison), syphilis at 7.5 per 100,000 (4 cases, too few for a reliable comparison). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Boone County has confidential testing locations available.
STD Trends in Boone 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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Boone County vs Illinois and the US
| Infection | Boone County | Illinois | US | vs Illinois | vs US | Rank in Illinois |
|---|---|---|---|---|---|---|
| Chlamydia | 300.7160 cases | 557.7 | 490.7 | 46.1% below | 38.7% below | 36th of 102 |
| Gonorrhea | 33.818 cases | 202.3 | 178.2 | Too few cases | Too few cases | – |
| Syphilis (P&S) | 7.54 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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