STD Rates in Larimer County, Colorado

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

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Data Year: 2023 Source: CDC STI Surveillance Population: 370,815
Combined
329.5
per 100K
29th / 61
Chlamydia
274.8
per 100K • 1,019 cases
Gonorrhea
50.4
per 100K • 187 cases
Syphilis P&S
4.3
per 100K • 16 cases

Larimer County reported a combined STD rate of 329.5 per 100,000 residents in 2023, placing it 29th of 61 Colorado counties — in the upper half of the state. Reported infections included chlamydia at 274.8 per 100,000 (1,019 cases, 37% below the state rate), gonorrhea at 50.4 per 100,000 (187 cases, 61% below the state rate), syphilis at 4.3 per 100,000 (16 cases, 73% below the state rate). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Larimer County has confidential testing locations available.

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Larimer County vs Colorado Average

Infection Larimer County Colorado Rate Difference
Chlamydia 274.8 435.1 37% below
Gonorrhea 50.4 128.7 61% below
Syphilis (P&S) 4.3 16 73% below

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Largest cities in Larimer County, Colorado

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

STD testing in Fort Collins, CO170,229 people → STD testing in Loveland, CO78,410 people → STD testing in Berthoud, CO12,411 people → STD testing in Wellington, CO11,798 people → STD testing in Timnath, CO8,941 people → STD testing in Estes Park, CO5,844 people →

Largest Counties in Colorado

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

All 61 Colorado counties → STD testing in Colorado →

FAQs

Larimer County ranks 29th of 61 Colorado counties for combined STD rate in 2023, at 329.5 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Larimer County, with 1,019 cases at a rate of 274.8 per 100,000 residents.
STDTest.com lists confidential testing locations across Larimer 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