STD Rates in Dekalb County, Illinois
2023 CDC surveillance data for Dekalb County, Illinois — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Dekalb County has one of the higher STD burdens in Illinois, with a combined rate of 613.3 per 100,000 residents in 2023 — ranking 20th of 102 counties. Reported infections included chlamydia at 501.6 per 100,000 (503 cases, 10% below the state rate), gonorrhea at 105.7 per 100,000 (106 cases, 48% below the state rate), syphilis at 6.0 per 100,000 (6 cases, too few for a reliable comparison). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Dekalb County has confidential testing locations available.
STD Trends in Dekalb 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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Dekalb County vs Illinois and the US
| Infection | Dekalb County | Illinois | US | vs Illinois | vs US | Rank in Illinois |
|---|---|---|---|---|---|---|
| Chlamydia | 501.6503 cases | 557.7 | 490.7 | 10.1% below | 2.2% above | 16th of 102 |
| Gonorrhea | 105.7106 cases | 202.3 | 178.2 | 47.8% below | 40.7% below | 29th of 102 |
| Syphilis (P&S) | 66 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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