STD Rates in Sangamon County, Illinois

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

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Data Year: 2023 Source: CDC STI Surveillance Population: 193,499
Combined
911.1
per 100K
10th / 102
Chlamydia
590.7
per 100K • 1,143 cases
Gonorrhea
304.4
per 100K • 589 cases
Syphilis P&S
16
per 100K • 31 cases

Sangamon County has one of the higher STD burdens in Illinois, with a combined rate of 911.1 per 100,000 residents in 2023 — ranking 10th of 102 counties. Reported infections included chlamydia at 590.7 per 100,000 (1,143 cases, 6% above the state rate), gonorrhea at 304.4 per 100,000 (589 cases, 50% above the state rate), syphilis at 16.0 per 100,000 (31 cases, 38% above the state rate). Many STDs show no symptoms, so testing is the only reliable way to know your status. Confidential options are available across Sangamon County.

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Sangamon County vs Illinois Average

Infection Sangamon County Illinois Rate Difference
Chlamydia 590.7 557.7 6% above
Gonorrhea 304.4 202.3 50% above
Syphilis (P&S) 16 11.6 38% above

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Largest cities in Sangamon County, Illinois

Largest first, by Census population. Each city page lists nearby clinics, free and low-cost testing, and labs.

STD testing in Springfield, IL113,330 people → STD testing in Chatham, IL14,639 people →

Largest Counties in Illinois

Cook County → Dupage County → Lake County → Will County → Kane County → Mchenry County → Winnebago County → Madison County → St. Clair County → Champaign County →

All 102 Illinois counties → STD testing in Illinois →

FAQs

Sangamon County ranks 10th of 102 Illinois counties for combined STD rate in 2023, at 911.1 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Sangamon County, with 1,143 cases at a rate of 590.7 per 100,000 residents.
STDTest.com lists confidential testing locations across Sangamon County and Illinois. Many offer same-day appointments with results in 1–3 days.

Related Resources

STD Testing Window Periods How Soon After Sex to Test STD Symptoms Guide Testing Timeline Chart All Testing Clinics STD Statistics and Data
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.
Sources