STD Rates in Snohomish County, Washington

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

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Data Year: 2023 Source: CDC STI Surveillance Population: 844,875
Combined
335.4
per 100K
23rd / 39
Chlamydia
252.7
per 100K • 2,135 cases
Gonorrhea
74.7
per 100K • 631 cases
Syphilis P&S
8
per 100K • 68 cases

Snohomish County recorded a combined STD rate of 335.4 per 100,000 residents in 2023, ranking 23rd of 39 counties in Washington. Reported infections included chlamydia at 252.7 per 100,000 (2,135 cases, 29% below the state rate), gonorrhea at 74.7 per 100,000 (631 cases, 42% below the state rate), syphilis at 8.0 per 100,000 (68 cases, 62% below the state rate). Routine testing is the surest way to catch STDs early, since many produce no symptoms. Snohomish County has confidential testing locations available.

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Snohomish County vs Washington Average

Infection Snohomish County Washington Rate Difference
Chlamydia 252.7 354.4 29% below
Gonorrhea 74.7 129.6 42% below
Syphilis (P&S) 8 21.3 62% below

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Largest cities in Snohomish County, Washington

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

STD testing in Everett, WA111,845 people → STD testing in Marysville, WA73,002 people → STD testing in Edmonds, WA42,735 people → STD testing in Lake Stevens, WA40,253 people → STD testing in Lynnwood, WA40,110 people → STD testing in Eastmont, WA23,721 people → STD testing in North Lynnwood, WA23,339 people → STD testing in Mountlake Terrace, WA23,104 people → STD testing in Martha Lake, WA22,634 people → STD testing in Silver Firs, WA22,306 people →
Show all 18 cities ↓Show fewer cities ↑
STD testing in Mukilteo, WA21,323 people → STD testing in Arlington, WA21,095 people → STD testing in Mill Creek, WA20,956 people → STD testing in Monroe, WA19,755 people → STD testing in Maltby, WA10,910 people → STD testing in Picnic Point, WA10,261 people → STD testing in Snohomish, WA10,239 people → STD testing in Tulalip, WA →

Largest Counties in Washington

King County → Pierce County → Spokane County → Clark County → Thurston County → Kitsap County → Yakima County → Whatcom County → Benton County → Skagit County →

All 39 Washington counties → STD testing in Washington →

FAQs

Snohomish County ranks 23rd of 39 Washington counties for combined STD rate in 2023, at 335.4 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in Snohomish County, with 2,135 cases at a rate of 252.7 per 100,000 residents.
STDTest.com lists confidential testing locations across Snohomish County and Washington. Many offer same-day appointments with results in 1–3 days.

Related Resources

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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