STD Rates in St. Louis County, Missouri
2023 CDC surveillance data for St. Louis County, Missouri — chlamydia, gonorrhea, and syphilis rates with state comparisons.
St. Louis County has one of the higher STD burdens in Missouri, with a combined rate of 946.0 per 100,000 residents in 2023 — ranking 5th of 115 counties. Reported infections included chlamydia at 635.3 per 100,000 (6,271 cases, 27% above the state rate), gonorrhea at 294.7 per 100,000 (2,909 cases, 46% above the state rate), syphilis at 16.0 per 100,000 (158 cases, 26% below the state rate). Routine testing is the surest way to catch STDs early, since many produce no symptoms. St. Louis County has confidential testing locations available.
STD Trends in St. Louis County, 2000–2023
Reported cases per 100,000 residents each year, against the Missouri 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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St. Louis County vs Missouri and the US
| Infection | St. Louis County | Missouri | US | vs Missouri | vs US | Rank in Missouri |
|---|---|---|---|---|---|---|
| Chlamydia | 635.36,271 cases | 498.6 | 490.7 | 27.4% above | 29.5% above | 5th of 115 |
| Gonorrhea | 294.72,909 cases | 201.9 | 178.2 | 46% above | 65.4% above | 4th of 115 |
| Syphilis (P&S) | 16158 cases | 21.5 | 15.8 | 25.6% below | 1.3% above | 34th of 115 |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Missouri’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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