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King County departments make data publicly available to enable transparency, improve access to County services, and promote economic development opportunities. Explore the links below to discover King County's most interesting data!

Find the latest information about COVID-19 in King County here:

Sources of public data from King County:

Open Data
View, download, and analyze data published by King County Departments and Agencies
Geographic Data
Putting geographic information to work for King County and beyond
Transportation Data
Build custom transit maps using datasets from King County Metro Transit
Elections Data
Get the latest election results and find ballot return locations across King County
Public Safety Data
King County Sheriff's Office data includes incident details such as time, place and crime
Performance Data
Information on progress towards significant King County initiatives
Property Data
Detailed property information from the King County Assessor's Office
Public Health Data
A comprehensive overview of demographics, health, and health behaviors among King County residents
gi-leaf Environment Data
Environmental Data from King County's Department of Natural Resources and Parks