STD Rates in Marion County, Indiana

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

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Data Year: 2023 Source: CDC STI Surveillance Population: 968,486
Combined
1539.3
per 100K
1st / 92
Chlamydia
1110.6
per 100K • 10,756 cases
Gonorrhea
407.7
per 100K • 3,948 cases
Syphilis P&S
21
per 100K • 203 cases

Marion County has one of the higher STD burdens in Indiana, with a combined rate of 1,539.3 per 100,000 residents in 2023 — ranking 1st of 92 counties. Reported infections included chlamydia at 1110.6 per 100,000 (10,756 cases, 126% above the state rate), gonorrhea at 407.7 per 100,000 (3,948 cases, 183% above the state rate), syphilis at 21.0 per 100,000 (203 cases, 141% 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 Marion County.

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Marion County vs Indiana Average

Infection Marion County Indiana Rate Difference
Chlamydia 1110.6 491 126% above
Gonorrhea 407.7 144 183% above
Syphilis (P&S) 21 8.7 141% above

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Largest cities in Marion County, Indiana

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

STD testing in Indianapolis, IN885,860 people → STD testing in Lawrence, IN49,517 people → STD testing in Beech Grove, IN14,913 people → STD testing in Speedway, IN13,968 people →

Largest Counties in Indiana

Lake County → Allen County → Hamilton County → St. Joseph County → Elkhart County → Tippecanoe County → Hendricks County → Vanderburgh County → Porter County → Johnson County →

All 92 Indiana counties → STD testing in Indiana →

FAQs

Marion County ranks 1st of 92 Indiana counties for combined STD rate in 2023, at 1,539.3 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Marion County, with 10,756 cases at a rate of 1110.6 per 100,000 residents.
STDTest.com lists confidential testing locations across Marion County and Indiana. 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