Skip to main content

Summary of COVID-19 vaccination among King County residents

Updated monthly

This page contains updated and consolidated COVID-19 vaccination information. This new format aims to improve the accessibility of our content. Our page has been updated to be more compatible with assistive devices, language translation, and mobile devices. For up-to-date information, visit our Respiratory virus data dashboards.

 

This page shows how many people have been vaccinated for COVID-19 and progress towards equitable vaccine delivery across all racial and ethnic groups and regions of the county.

Current Snapshot

This section shows vaccination coverage for the 2023-2024 updated vaccine for King County residents. 2023-2024 updated vaccine refers to any dose of the updated 2023-2024 formula (which targets the XBB lineage of the Omicron variant). The estimated 2022 King County population is 2,317,700 residents. This page uses CDC guidance from October 2023.

Equity in coverage

This section shows vaccination coverage for the 2023-2024 updated vaccine for King County residents by region. It also compares the coverage by race/ethnicity in each region to the county average to show equity in coverage of the 2023-2024 updated vaccine. 2023-2024 updated vaccine refers to any dose of the updated 2023-2024 formula (which targets the XBB lineage of the Omicron variant). The estimated 2022 King County population is 2,317,700 residents.

COVID-19 vaccine doses administered to King County residents over time

This section shows COVID-19 vaccinations in the King County population over time. Original vaccine series refers to the original vaccine formula. Original booster refers to any additional dose of the original vaccine formula given after the original vaccine series. 2022-2023 bivalent vaccine refers to any dose of the 2022-2023 bivalent formula. 2023-2024 updated vaccine refers to any dose of the updated 2023-2024 formula (which targets the XBB lineage of the Omicron variant). The estimated 2022 King County population is 2,317,700 residents.

Data notes

Vaccination data are from the Washington State Immunization Information System (WAIIS). Due to reporting lags, all data are preliminary and subject to change. Data will be refreshed retrospectively with ongoing data quality improvements.


Demographics

Demographic data (age, race/ethnicity, and residential area) are also from WAIIS. Missing demographic data in WAIIS are supplemented with demographic data from case reporting where available.


Definitions of key terms on this dashboard

Original vaccine series refers to the original COVID-19 vaccine formulations which were designed to target the original virus that causes COVID-19. The original series, previously called the primary series, ranged from 1-3 doses depending on the vaccine manufacturer and person’s age. The original vaccine series was first authorized in December 2020. As of April 18, 2023, these original vaccines are no longer recommended in favor of updated vaccine formulations.

Original booster refers to any additional dose of the original vaccine given after the original series. The original vaccine formulations were designed to target the original virus that causes COVID-19. These original booster doses were first authorized by the FDA on August 31, 2021. As of August 31, 2022, they are no longer recommended, in favor of the updated formulations.

2022-2023 bivalent vaccine refers to any dose of the 2022-2023 bivalent formulation, which targeted the BA.4 and BA.5 lineages of the Omicron variant in addition to the original strain of the virus that causes COVID-19. The 2022-2023 bivalent vaccine was first authorized by the FDA on August 31, 2022, and is no longer recommend as of September 11, 2023, in favor of the 2023-2024 updated vaccine formulation.

2023-2024 updated vaccine refers to any dose of the 2023 formulation, which targets the XBB lineage of the Omicron variant of the virus that causes COVID-19. Doses are counted as the 2023-2024 formula when they have a 2023-2024 updated formula product code and are administered on or after the FDA authorization date on September 11, 2023.

Residents recommended for the 2023-2024 updated vaccine refers to any King County resident who is 6 months old or older, as long as at least two months have passed since their most recent prior COVID-19 vaccination dose.

Additional details on CDC's definitions of the different COVID-19 vaccine formulations and staying up to date with COVID-19 vaccination can be found on the CDC’s website. This page uses the CDC guidance released on 10/4/2023.


People with compromised immune systems

People with compromised immune systems have different recommendations for COVID-19 vaccines than people with healthy immune systems. Typically, more doses are recommended. However, we do not have data to identify recipients with a compromised immune system who therefore require more doses to achieve vaccination coverage. As a result, this dashboard may slightly overestimate the number of recipients who've completed a primary series and the number of recipients who are up to date. Dose recommendations from the CDC for people with immune compromise can be found on the CDC’s website


Percentages

To estimate coverage percentages, 2022 Population Interim Estimates (PIE) developed by Public Health – Seattle & King County are used. The estimated 2022 King County population is 2,317,700 residents. Because we have applied PIE for different years to historic data, some estimated coverage percentages will be different from what we published previously. Vaccination counts from WAIIS may exceed population estimates and lead to greater than 100% estimated coverage, especially among populations with fewer residents or higher levels of misclassification of race or ethnicity. To reflect the level of precision of the coverage estimates, any coverage estimate above 95% is shown as ">95%."

expand_less