STD Rates in Yellowstone County, Montana
2023 CDC surveillance data for Yellowstone County, Montana — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Yellowstone County has one of the higher STD burdens in Montana, with a combined rate of 520.3 per 100,000 residents in 2023 — ranking 6th of 51 counties. Reported infections included chlamydia at 375.2 per 100,000 (641 cases, 16% above the state rate), gonorrhea at 87.2 per 100,000 (149 cases, 29% above the state rate), syphilis at 57.9 per 100,000 (99 cases, 111% above the state rate). Confidential STD testing is available throughout Yellowstone County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Yellowstone County, 2000–2023
Reported cases per 100,000 residents each year, against the Montana 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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Yellowstone County vs Montana and the US
| Infection | Yellowstone County | Montana | US | vs Montana | vs US | Rank in Montana |
|---|---|---|---|---|---|---|
| Chlamydia | 375.2641 cases | 322.6 | 490.7 | 16.3% above | 23.5% below | 8th of 51 |
| Gonorrhea | 87.2149 cases | 67.7 | 178.2 | 28.8% above | 51.1% below | 10th of 51 |
| Syphilis (P&S) | 57.999 cases | 27.5 | 15.8 | 110.5% above | 266.5% above | 5th of 51 |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Montana’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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