STD Rates in Mellette County, South Dakota
2023 CDC surveillance data for Mellette County, South Dakota — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Mellette County has one of the higher STD burdens in South Dakota, with a combined rate of 2,377.1 per 100,000 residents in 2023 — ranking 8th of 64 counties. Reported infections included chlamydia at 1242.6 per 100,000 (23 cases, 134% above the state rate), gonorrhea at 972.4 per 100,000 (18 cases, too few for a reliable comparison), syphilis at 162.1 per 100,000 (3 cases, too few for a reliable comparison). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Mellette County has confidential testing locations available.
STD Trends in Mellette 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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Mellette County vs South Dakota and the US
| Infection | Mellette County | South Dakota | US | vs South Dakota | vs US | Rank in South Dakota |
|---|---|---|---|---|---|---|
| Chlamydia | 1242.623 cases | 531.6 | 490.7 | 133.7% above | 153.2% above | 8th of 64 |
| Gonorrhea | 972.418 cases | 253.3 | 178.2 | Too few cases | Too few cases | – |
| Syphilis (P&S) | 162.13 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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