STD Rates in Iroquois County, Illinois

2023 CDC surveillance data for Iroquois County, Illinois — chlamydia, gonorrhea, and syphilis rates with state comparisons.

Data Year: 2023 Source: CDC STI Surveillance Population: 26,131
Combined
317.7
per 100K
52nd / 102
Chlamydia
256.4
per 100K • 67 cases
US rate: 490.7
50th of 102 in Illinois
Higher than 44% of US counties
Gonorrhea
53.6
per 100K • 14 cases
Based on 14 cases — interpret with care
US rate: 178.2
Syphilis P&S
7.7
per 100K • 2 cases
Based on 2 cases — interpret with care
US rate: 15.8

Iroquois County recorded a combined STD rate of 317.7 per 100,000 residents in 2023, ranking 52nd of 102 counties in Illinois. Reported infections included chlamydia at 256.4 per 100,000 (67 cases, 54% below the state rate), gonorrhea at 53.6 per 100,000 (14 cases, too few for a reliable comparison), syphilis at 7.7 per 100,000 (2 cases, too few for a reliable comparison). Many STDs show no symptoms, so testing is the only reliable way to know your status. Confidential options are available across Iroquois County.

STD Trends in Iroquois 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.

Chlamydia
256.4
per 100K in 2023
92.4 in 2000
Peak 348.0 in 2016
Gonorrhea
53.6
per 100K in 2023
12.7 in 2000
Peak 110.8 in 2020
Syphilis (P&S)
7.7
per 100K in 2023
0.0 in 2000
Peak 7.7 in 2023

Source: CDC NCHHSTP AtlasPlus county surveillance, 2000–2023.

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Iroquois County vs Illinois and the US

Infection Iroquois County Illinois US vs Illinois vs US Rank in Illinois
Chlamydia 256.467 cases 557.7 490.7 54% below 47.7% below 50th of 102
Gonorrhea 53.614 cases 202.3 178.2 Too few cases Too few cases –
Syphilis (P&S) 7.72 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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FAQs

Iroquois County ranks 52nd of 102 Illinois counties for combined STD rate in 2023, at 317.7 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Iroquois County, with 67 cases at a rate of 256.4 per 100,000 residents.
STDTest.com lists confidential testing locations across Iroquois County and Illinois. Many offer same-day appointments with results in 1–3 days.
Data sourced from the CDC's annual STI Surveillance Report. Rates are per 100,000 population and reflect reported cases only — actual prevalence is likely higher due to undiagnosed infections. While we strive for accuracy, STDTest.com makes no representations or warranties regarding the completeness or accuracy of this data and is not responsible for any errors or omissions. This page is for informational purposes only and does not constitute medical advice.