STD Rates in Buffalo County, South Dakota
2023 CDC surveillance data for Buffalo County, South Dakota — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Buffalo County has one of the higher STD burdens in South Dakota, with a combined rate of 5,467.1 per 100,000 residents in 2023 — ranking 3rd of 64 counties. Reported infections included chlamydia at 2388.5 per 100,000 (45 cases, 349% above the state rate), gonorrhea at 2070.1 per 100,000 (39 cases, 717% above the state rate), syphilis at 1008.5 per 100,000 (19 cases, too few for a reliable comparison). Confidential STD testing is available throughout Buffalo County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Buffalo County, 2000–2023
Reported cases per 100,000 residents each year, against the South Dakota 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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Buffalo County vs South Dakota and the US
| Infection | Buffalo County | South Dakota | US | vs South Dakota | vs US | Rank in South Dakota |
|---|---|---|---|---|---|---|
| Chlamydia | 2388.545 cases | 531.6 | 490.7 | 349.3% above | 386.8% above | 4th of 64 |
| Gonorrhea | 2070.139 cases | 253.3 | 178.2 | 717.3% above | 1061.7% above | 2nd of 64 |
| Syphilis (P&S) | 1008.519 cases | 73.4 | 15.8 | Too few cases | Too few cases | – |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among South Dakota’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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