Testing saves lives and lets people know if they need to take precautions, like isolating, to stop the virus from spreading; infected people without symptoms can still spread the virus. Testing also helps public health officials identify and respond to outbreaks, and to track new variants of the virus.
COVID-19 testing sites by location
See the list below for free or low-cost COVID-19 testing available throughout King County.
You will be asked to provide your ID and insurance card (if you have insurance), but it is not required to be tested.
These sites are not operated by King County and there may be a cost for their testing services. Please check their website for more information.
Select a city below to find a testing site near you.
Select a tab below to view definition
Antigen tests, sometimes called a "self-test", “rapid test” or “home test,” detect virus proteins in the body. Antigen self-tests use saliva and nasal swab samples. Results take 15-30 minutes.
Certain groups of people are considered high risk and are more likely to get seriously ill from COVID‑19. People over 60, unvaccinated people, people with underlying health issues, and pregnant people may be at higher risk.
Isolation separates sick people with a contagious disease from people who are not sick.
Tests that detect if COVID‑19 genetic material is in the body. These tests are done on samples collected via a nasal swab (from the nose). These tests include PCR and TMA.
Quarantine separates and restricts the movement of people who were exposed to a contagious disease to see if they become sick.
Testing that is repeated at different points in time is referred to as serial testing. Some self-tests are designed to be used in a series 24 to 48 hours apart. Serial testing may be more likely to detect infection among close contacts of a COVID‑19 case than testing done at a single point in time.