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Overview

As part of the response to an outbreak of novel coronavirus (COVID-19), Public Health – Seattle & King County has prepared downloadable COVID-19 data, which are updated weekly.

These weekly data extracts summarize the COVID-19 epidemic in King County at multiple geographic levels (10 region, city, health reporting area, ZIP code, census tract, and school district) and time scales (daily, weekly, and overall). These data reflect reports for King County residents received through midnight of the day prior to update. To protect individual privacy, within geographic levels smaller than King County, demographic categories where the count of cases, hospitalizations, or deaths is fewer than ten are suppressed and replaced with zeroes and a small, random amount of noise has been added to demographic categories where the count is greater than 10.

For more information about data sources, definitions, and data lags, see About the data.

The following data are available for download in Microsoft Excel format. Be sure to press refresh or reload on your web browser to ensure you're accessing the latest versions:

Outcomes datasets

Vaccination and outcomes by vaccination status datasets


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Data definitions and notes Data of outcomes by vaccination status definitions and notes

Datasets

Outcome datasets

The data are provided weekly as Microsoft Excel files. There are separate files for each of the following geographic levels:

  • King County
  • 10 Region
  • Census Tract
  • City
  • Health Reporting Area
  • School District
  • ZIP Code

Each Excel workbook includes data on the estimated 2020 population for each geographic level, counts of total COVID-19 test results, positive cases, hospitalizations, and deaths. These data are presented in the following tabs:

  • Overall counts of total COVID-19 test results, positive cases, hospitalizations, and deaths
  • Overall counts of total COVID-19 test results, positive cases, hospitalizations, and deaths by age
  • Overall counts of total COVID-19 test results, positive cases, hospitalizations, and deaths by race/ethnicity
  • Overall counts of total COVID-19 test results, positive cases, hospitalizations, and deaths by sex
  • Weekly counts of total COVID-19 test results, positive cases, hospitalizations, and deaths
  • Daily counts of total COVID-19 test results, positive cases, hospitalizations, and deaths

The Excel workbook for all of King County also includes these additional tabs:

  • Weekly counts of total COVID-19 test results, positive cases, hospitalizations, and deaths by age
  • Weekly counts of total COVID-19 test results, positive cases, hospitalizations, and deaths by race/ethnicity
  • Weekly counts of total COVID-19 test results, positive cases, hospitalizations, and deaths by sex

Vaccination and outcomes by vaccination status datasets

The data are provided weekly as Microsoft Excel files as outlined below:

  • Overall vaccination rates: This Excel workbook includes three tabs containing vaccination doses by day, demographic, and zip code. Vaccination doses are separated by vaccine manufacturer.
  • Counts by vaccination status: This Excel workbook includes three tabs containing daily counts and rates of positives, hospitalizations, and deaths in King County by vaccination status. Vaccination status includes not fully vaccinated, fully vaccinated, and boosted. Data are aggregated across three time periods: before the Omicron surge (1/17/2021 to 12/1/2021), since the Omicron surge (since 12/1/2021), and the past 30 days.
  • Daily counts by vaccination status: This Excel workbook includes three tabs containing daily counts and rates of positives, hospitalizations, and deaths in King County by vaccination status. Vaccination status includes not fully vaccinated, fully vaccinated, and boosted.
  • Counts by demographics and vaccination status: This Excel workbook includes three tabs containing daily counts and rates of positives, hospitalizations, and deaths in King County by vaccination status. Vaccination status includes not fully vaccinated, fully vaccinated, and boosted. Data are aggregated across three demographic categories: age group, race/ethnicity, and sex at birth.
  • Counts by region and vaccination status: This Excel workbook includes three tabs containing daily counts and rates of positives, hospitalizations, and deaths in King County by vaccination status. Vaccination status includes not fully vaccinated, fully vaccinated, and boosted. Data are aggregated across 10 regions.

Data definitions and notes

  • Geographic levels:
    • 10 Region: Regions are groups of HRAs.
    • Census Tract: Census tracts are defined by the United States Census Bureau.
    • City: Includes incorporated cities and major unincorporated cities/towns in King County.
    • Health Reporting Area (HRA): Neighborhoods that closely align with city boundaries and were created to aid in considering issues related to health status or health policies (more information about health reporting areas are available here).
    • School District: School districts are defined by state legislation.
    • ZIP Code: ZIP codes are defined by the United States Postal Service.
  • Population: Population is estimated for the specified geographic level. 2020 King County population estimates for incorporated cities, health reporting areas, ZIP codes, and census tracts are obtained from the Washington State Office of Financial Management (OFM). For unincorporated areas, population estimates were obtained from the 2018 American Community Survey because OFM does not provide population estimates for unincorporated areas. These estimates may be imprecise when looking at small numbers, especially unvaccinated individuals in some demographic or geographic groups. These measurement errors are corrected using a 5% continuity correction. More information can be found in the technical appendix.
    • Note: Due to data quality issues with address information for negative test results, the number of tested individuals in zip codes 98164 and 98195 and census tract 53033008100 are greater than the total population in these areas.
  • Test Results: Count of all COVID-19 PCR laboratory results reported to the Washington State Department of Health. If a person was tested multiple times, all their test results are counted until the date of the first positive test. If a person tests positive an additional time and it has been 90 days or more since their initial test, this test is counted as a new case.
  • Positive Cases: Count of a positive COVID-19 antigen test or a confirmed positive PCR laboratory result reported to the Washington State Department of Health by a King County resident.
  • Hospitalizations: Count of King Country residents who have tested positive for COVID-19 and have been hospitalized. In some cases, COVID-19 may be an incidental finding and not the primary reason for hospitalization. Hospital records are reviewed by Public Health-Seattle & King County investigators when there is a question about the primary reason for a hospitalization. Those that are deemed incidental are excluded from the official count of COVID-19 hospitalizations.
  • Deaths: Count of King County residents who have died due to COVID-19. Confirmed deaths include decedents who tested positive and had COVID-19 infection listed on their death certificate as either a contributing cause or other significant condition.
  • Demographic characteristics: Demographic information is collected by interviewing cases, medical notes, test results, or by matching with other data sources. Large numbers of cases are missing demographic details, particularly race/ethnicity. Small numbers and missing data should be considered when interpreting the data, as some age groups and race/ethnicity groups have very small counts of outcomes.
    • Age groups: Age is grouped into the following categories: 0-4, 5-11, 12-17, 18-34, 35-49, 50-64, 65-79, and 80+.
    • Sex at birth: Sex at birth is categorized as female, male, and unknown.
    • Race/ethnicity: Race/ethnicity categories are defined as follows:
      • For individuals of Hispanic/Latinx ethnicity, race/ethnicity is categorized as "Hispanic"
      • For individuals of non-Hispanic/Latinx ethnicity, race/ethnicity is categorized based on the race they selected
      • For individuals of non-Hispanic/Latinx ethnicity who specified multiple race categories, race/ethnicity is categorized as "multi-racial"

Data of outcomes by vaccination status definitions and notes

  • Population estimates: populations of vaccinated and not fully vaccinated individuals are derived from 2020 King County population estimates. These estimates may be imprecise when looking at small numbers, especially unvaccinated individuals in some demographic or geographic groups. These measurement errors are corrected using a 5% continuity correction. More information can be found in the technical appendix.
    • Population boosted/fully vaccinated/not fully vaccinated (in outcomes_daily): these populations are cumulative totals.
    • Approximate population percent (in outcomes_geo, outcomes_demo, and outcomes_overall): percentages are calculated using person-time at risk. Individuals may occupy different vaccination categories over time (I.e., an individual may be unvaccinated and then become fully vaccinated), therefore we calculate person-time, which is the number of days a person was considered boosted, fully vaccinated, or not fully vaccinated.
  • Vaccination status:
    • Not fully vaccinated: individuals who have not yet received any vaccine doses of any COVID-19 vaccine, individuals who have started their COVID-19 vaccine series, and individuals who have completed their COVID-19 vaccine series within the past 14 days.
    • Fully vaccinated: individuals who have received 2 doses of a mRNA or one dose of the Janssen COVID-19 vaccine and have had at least 14 days to establish protection and who have not yet had their booster dose (or have had their booster dose but have not had 14 days to establish protection). Fully vaccinated cases include individuals who have tested positive for COVID-19 (either a PCR or antigen test) at least 14 days after they completed their vaccination series.
    • Boosted: individuals who received a third dose following their full mRNA COVID-19 series or a second dose following their Janssen COVID-19 vaccine and have had at least 14 days to establish protection. Boosted cases include individuals who have tested positive for COVID-19 (either a PCR test or antigen test) at least 14 days after they received a booster dose.
  • Average positives/hospitalization/death rate (in outcomes_daily): Rate of each outcome (count of each outcome divided by total population) per 100,000 residents averaged over the most recent 7-day period. Cases are counted on the date of an individual's positive COVID-19 test; hospitalizations are counted on the date an individual's hospital admission; deaths are counted on the date of death. Rates are not age standardized.
  • Average adjusted positives/hospitalization/death Rate (in outcomes_daily): Rate of each outcome (count of each outcome divided by total population) averaged over the most recent 7-day period. Cases are counted on the date of an individual's positive COVID-19 test; hospitalizations are counted on the date an individual's hospital admission; death are counted on the date of death. Rates are age standardized.
  • Adjusted positives/hospitalization/death Rate (in outcomes_geo, outcomes_demo, and outcomes_overall): Rate of each outcome (count of each outcome divided by total population). Cases are counted on the date of an individual's positive COVID-19 test; hospitalizations are counted on the date an individual's hospital admission; death are counted on the date of death. Rates are adjusted for age and time; for more information on adjustments, see the technical appendix.
  • Positives/Hospitalization/Death total: total outcomes for all vaccination statuses.
  • RR: these variables are relative risks.