STD Rates in King County, Washington

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

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Data Year: 2023 Source: CDC STI Surveillance Population: 2,271,605
Combined
547.9
per 100K
9th / 39
Chlamydia
324
per 100K • 7,360 cases
US rate: 490.7
18th of 39 in Washington
Higher than 57% of US counties
Gonorrhea
198.5
per 100K • 4,509 cases
US rate: 178.2
1st of 39 in Washington
Higher than 84% of US counties
Syphilis P&S
25.4
per 100K • 578 cases
US rate: 15.8
6th of 39 in Washington
Higher than 85% of US counties

King County has one of the higher STD burdens in Washington, with a combined rate of 547.9 per 100,000 residents in 2023 — ranking 9th of 39 counties. Reported infections included chlamydia at 324.0 per 100,000 (7,360 cases, 9% below the state rate), gonorrhea at 198.5 per 100,000 (4,509 cases, 53% above the state rate), syphilis at 25.4 per 100,000 (578 cases, 19% above the state rate). Confidential STD testing is available throughout King County — knowing your status is the only way to catch infections that often show no symptoms.

STD Trends in King 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
324.0
per 100K in 2023
258.4 in 2000
Peak 516.7 in 2019
Gonorrhea
198.5
per 100K in 2023
70.2 in 2000
Peak 206.0 in 2019
Syphilis (P&S)
25.4
per 100K in 2023
2.9 in 2000
Peak 29.9 in 2022

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

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King County vs Washington and the US

Infection King County Washington US vs Washington vs US Rank in Washington
Chlamydia 3247,360 cases 354.4 490.7 8.6% below 34% below 18th of 39
Gonorrhea 198.54,509 cases 129.6 178.2 53.2% above 11.4% above 1st of 39
Syphilis (P&S) 25.4578 cases 21.3 15.8 19.2% above 60.8% above 6th 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.

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Largest cities in King County, Washington

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

STD testing in Seattle, WA754,195 people → STD testing in Bellevue, WA151,847 people → STD testing in Kent, WA135,603 people → STD testing in Renton, WA105,317 people → STD testing in Federal Way, WA99,493 people → STD testing in Kirkland, WA92,621 people → STD testing in Auburn, WA85,676 people → STD testing in Redmond, WA77,353 people → STD testing in Sammamish, WA66,463 people → STD testing in Shoreline, WA61,431 people →
Show all 32 cities ↓Show fewer cities ↑
STD testing in Burien, WA51,513 people → STD testing in Bothell, WA49,610 people → STD testing in Issaquah, WA39,591 people → STD testing in Des Moines, WA32,823 people → STD testing in Seatac, WA32,414 people → STD testing in Maple Valley, WA28,287 people → STD testing in Mercer Island, WA25,307 people → STD testing in Kenmore, WA23,741 people → STD testing in Cottage Lake, WA22,518 people → STD testing in Tukwila, WA21,451 people → STD testing in Covington, WA21,233 people → STD testing in White Center, WA14,886 people → STD testing in Snoqualmie, WA13,798 people → STD testing in Lake Forest Park, WA13,335 people → STD testing in Newcastle, WA12,989 people → STD testing in Enumclaw, WA12,798 people → STD testing in East Renton Highlands, WA12,582 people → STD testing in Vashon, WA9,934 people → STD testing in North Bend, WA7,953 people → STD testing in Kingsgate, WA → STD testing in Klahanie, WA → STD testing in Lea Hill, WA →

Largest Counties in Washington

Pierce County → Snohomish 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

King County ranks 9th of 39 Washington counties for combined STD rate in 2023, at 547.9 per 100,000 residents.
In 2023, chlamydia was the most frequently reported STD in King County, with 7,360 cases at a rate of 324.0 per 100,000 residents.
STDTest.com lists confidential testing locations across King 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