STD Rates in Lake County, Illinois

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

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Data Year: 2023 Source: CDC STI Surveillance Population: 708,682
Combined
461.9
per 100K
27th / 102
Chlamydia
382.4
per 100K • 2,710 cases
Gonorrhea
75.3
per 100K • 534 cases
Syphilis P&S
4.2
per 100K • 30 cases

Lake County reported a combined STD rate of 461.9 per 100,000 residents in 2023, placing it 27th of 102 Illinois counties — in the upper half of the state. Reported infections included chlamydia at 382.4 per 100,000 (2,710 cases, 31% below the state rate), gonorrhea at 75.3 per 100,000 (534 cases, 63% below the state rate), syphilis at 4.2 per 100,000 (30 cases, 64% below the state rate). Confidential STD testing is available throughout Lake County — knowing your status is the only way to catch infections that often show no symptoms.

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Lake County vs Illinois Average

Infection Lake County Illinois Rate Difference
Chlamydia 382.4 557.7 31% below
Gonorrhea 75.3 202.3 63% below
Syphilis (P&S) 4.2 11.6 64% below

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Largest cities in Lake County, Illinois

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

STD testing in Waukegan, IL89,076 people → STD testing in Buffalo Grove, IL42,891 people → STD testing in Mundelein, IL31,915 people → STD testing in North Chicago, IL30,643 people → STD testing in Gurnee, IL30,510 people → STD testing in Highland Park, IL30,398 people → STD testing in Round Lake Beach, IL27,079 people → STD testing in Vernon Hills, IL26,876 people → STD testing in Zion, IL24,600 people → STD testing in Grayslake, IL20,929 people →
Show all 26 cities ↓Show fewer cities ↑
STD testing in Libertyville, IL20,525 people → STD testing in Lake Zurich, IL19,832 people → STD testing in Deerfield, IL19,518 people → STD testing in Lake Forest, IL19,416 people → STD testing in Round Lake, IL18,628 people → STD testing in Antioch, IL14,859 people → STD testing in Lindenhurst, IL14,417 people → STD testing in Beach Park, IL14,115 people → STD testing in Wauconda, IL14,027 people → STD testing in Fox Lake, IL11,131 people → STD testing in Gages Lake, IL10,819 people → STD testing in Hawthorn Woods, IL9,143 people → STD testing in Lake Villa, IL8,683 people → STD testing in Long Grove, IL8,305 people → STD testing in Lincolnshire, IL7,980 people → STD testing in Round Lake Park, IL7,919 people →

Largest Counties in Illinois

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

All 102 Illinois counties → STD testing in Illinois →

FAQs

Lake County ranks 27th of 102 Illinois counties for combined STD rate in 2023, at 461.9 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Lake County, with 2,710 cases at a rate of 382.4 per 100,000 residents.
STDTest.com lists confidential testing locations across Lake 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