STD Rates in Snohomish County, Washington

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

Get Tested Now Find a Clinic
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
US rate: 490.7
24th of 39 in Washington
Higher than 43% of US counties
Gonorrhea
74.7
per 100K • 631 cases
US rate: 178.2
12th of 39 in Washington
Higher than 55% of US counties
Syphilis P&S
8
per 100K • 68 cases
US rate: 15.8
26th of 39 in Washington
Higher than 54% of US counties

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.

STD Trends in Snohomish County, 2000–2023

Reported cases per 100,000 residents each year, against the Washington 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.

Chlamydia
252.7
per 100K in 2023
183.1 in 2000
Peak 353.9 in 2019
Gonorrhea
74.7
per 100K in 2023
17.7 in 2000
Peak 106.6 in 2018
Syphilis (P&S)
8.0
per 100K in 2023
0.2 in 2000
Peak 11.7 in 2022

Source: CDC NCHHSTP AtlasPlus county surveillance, 2000–2023.

Know your status — get tested today

Same-day testing at 4,500+ locations. No appointment needed. Results in 1–3 days.

Compare Tests & Pricing Find a clinic

Snohomish County vs Washington and the US

Infection Snohomish County Washington US vs Washington vs US Rank in Washington
Chlamydia 252.72,135 cases 354.4 490.7 28.7% below 48.5% below 24th of 39
Gonorrhea 74.7631 cases 129.6 178.2 42.4% below 58.1% below 12th of 39
Syphilis (P&S) 868 cases 21.3 15.8 62.4% below 49.4% below 26th of 39

Rates per 100,000 residents, 2023. Ranks run from the highest rate (1st) among Washington’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.

Find a clinic near you

4,500+ testing locations nationwide. 100% confidential. Most insurance accepted.

Compare Tests & Pricing Find a clinic

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

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