STD Rates in Marion County, Indiana
2023 CDC surveillance data for Marion County, Indiana — chlamydia, gonorrhea, and syphilis rates with state comparisons.
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.
STD Trends in Marion County, 2000–2023
Reported cases per 100,000 residents each year, against the Indiana 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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Marion County vs Indiana and the US
| Infection | Marion County | Indiana | US | vs Indiana | vs US | Rank in Indiana |
|---|---|---|---|---|---|---|
| Chlamydia | 1110.610,756 cases | 491 | 490.7 | 126.2% above | 126.3% above | 1st of 92 |
| Gonorrhea | 407.73,948 cases | 144 | 178.2 | 183.1% above | 128.8% above | 1st of 92 |
| Syphilis (P&S) | 21203 cases | 8.7 | 15.8 | 141.4% above | 32.9% above | 3rd of 92 |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Indiana’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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