STD Rates in Boulder County, Colorado

2023 CDC surveillance data for Boulder County, Colorado — chlamydia, gonorrhea, and syphilis rates with state comparisons.

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Data Year: 2023 Source: CDC STI Surveillance Population: 326,793
Combined
405.8
per 100K
21st / 61
Chlamydia
326.2
per 100K • 1,066 cases
Gonorrhea
74.4
per 100K • 243 cases
Syphilis P&S
5.2
per 100K • 17 cases

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, 68% below the state rate). Confidential STD testing is available throughout Boulder County — knowing your status is the only way to catch infections that often show no symptoms.

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Boulder County vs Colorado Average

Infection Boulder County Colorado Rate Difference
Chlamydia 326.2 435.1 25% below
Gonorrhea 74.4 128.7 42% below
Syphilis (P&S) 5.2 16 68% below

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Largest cities in Boulder County, Colorado

Largest first, by Census population. Each city page lists nearby clinics, free and low-cost testing, and labs.

STD testing in Boulder, CO106,433 people → STD testing in Longmont, CO99,406 people → STD testing in Lafayette, CO30,602 people → STD testing in Louisville, CO20,786 people → STD testing in Superior, CO13,305 people → STD testing in Gunbarrel, CO10,051 people →

Largest Counties in Colorado

El Paso County → Denver County → Arapahoe County → Jefferson County → Adams County → Douglas County → Larimer County → Weld County → Pueblo County → Mesa County →

All 61 Colorado counties → STD testing in Colorado →

FAQs

Boulder County ranks 21st of 61 Colorado counties for combined STD rate in 2023, at 405.8 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Boulder County, with 1,066 cases at a rate of 326.2 per 100,000 residents.
STDTest.com lists confidential testing locations across Boulder County and Colorado. Many offer same-day appointments with results in 1–3 days.

Related Resources

STD Testing Window Periods How Soon After Sex to Test STD Symptoms Guide Testing Timeline Chart All Testing Clinics STD Statistics and Data
Data sourced from the CDC's annual STI Surveillance Report. Rates are per 100,000 population and reflect reported cases only — actual prevalence is likely higher due to undiagnosed infections. While we strive for accuracy, STDTest.com makes no representations or warranties regarding the completeness or accuracy of this data and is not responsible for any errors or omissions. This page is for informational purposes only and does not constitute medical advice.
Sources