STD Rates in Boulder County, Colorado
2023 CDC surveillance data for Boulder County, Colorado — chlamydia, gonorrhea, and syphilis rates with state comparisons.
Boulder County reported a combined STD rate of 405.8 per 100,000 residents in 2023, placing it 21st of 61 Colorado counties — in the upper half of the state. Reported infections included chlamydia at 326.2 per 100,000 (1,066 cases, 25% below the state rate), gonorrhea at 74.4 per 100,000 (243 cases, 42% below the state rate), syphilis at 5.2 per 100,000 (17 cases, too few for a reliable comparison). Confidential STD testing is available throughout Boulder County — knowing your status is the only way to catch infections that often show no symptoms.
STD Trends in Boulder County, 2000–2023
Reported cases per 100,000 residents each year, against the Colorado 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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Boulder County vs Colorado and the US
| Infection | Boulder County | Colorado | US | vs Colorado | vs US | Rank in Colorado |
|---|---|---|---|---|---|---|
| Chlamydia | 326.21,066 cases | 435.1 | 490.7 | 25% below | 33.5% below | 21st of 61 |
| Gonorrhea | 74.4243 cases | 128.7 | 178.2 | 42.2% below | 58.2% below | 15th of 61 |
| Syphilis (P&S) | 5.217 cases | 16 | 15.8 | Too few cases | Too few cases | – |
Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Colorado’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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