The population count of King County, WA was 1,940,777 in 2012. The population count of Pierce County, WA was 798,528 in 2012. The population count of Snohomish County, WA was 714,443 in 2012.

Population

Population Change

Above charts are based on data from the U.S. Census American Community Survey | ODN Dataset | API - Notes:

1. ODN datasets and APIs are subject to change and may differ in format from the original source data in order to provide a user-friendly experience on this site.

2. To build your own apps using this data, see the ODN Dataset and API links.

3. If you use this derived data in an app, we ask that you provide a link somewhere in your applications to the Open Data Network with a citation that states: "Data for this application was provided by the Open Data Network" where "Open Data Network" links to http://opendatanetwork.com. Where an application has a region specific module, we ask that you add an additional line that states: "Data about REGIONX was provided by the Open Data Network." where REGIONX is an HREF with a name for a geographical region like "Seattle, WA" and the link points to this page URL, e.g. http://opendatanetwork.com/region/1600000US5363000/Seattle_WA

Demographics and Population Datasets Involving Pierce County, WA or Snohomish County, WA or King County, WA

  • API

    WAOFM - Census - Population and Housing, 2000 and 2010

    data.wa.gov | Last Updated 2016-08-09T16:23:33.000Z

    Population and housing information extracted from decennial census Public Law 94-171 redistricting summary files for Washington state for years 2000 and 2010.

  • API

    WAOFM - Census - Population Density by County by Decade, 1900 to 2010

    data.wa.gov | Last Updated 2016-08-09T16:28:24.000Z

    Washington state population density by county by decade 1900 to 2010.

  • API

    Water Quality Index Scores (1994-2013) from The WA State Department of Ecology's River and Stream Monitoring Program.

    data.wa.gov | Last Updated 2014-05-01T22:58:16.000Z

    Routine freshwater monitoring data collected by the The WA State Department of Ecology's River and Stream Monitoring Program are summarized by a technique called the "Water Quality Index" (WQI). The WQI ranges from 1 (poor quality) to 100 (good quality). The WQI summary does not include non-standard elements like metals. For temperature, pH, oxygen, and fecal coliform bacteria, the WQI is based on criteria in Washington’s Water Quality Standards, WAC 173-201A. For nutrient and sediment measures where standards are not specific, results are based on expected conditions in a given region. Multiple constituents are combined and results aggregated over time to produce a single score for each station and each year.

  • API

    Washington Driver License In State Migration

    data.wa.gov | Last Updated 2019-01-03T23:56:56.000Z

    The number of drivers from other states and countries who were issued new Washington driver licenses and the county they moved to.

  • API

    Poverty Estimates for Washington Counties Age 0-17

    data.wa.gov | Last Updated 2016-01-21T05:40:06.000Z

  • API

    Admissions to Juvenile Detention Related to a Status Offense

    data.wa.gov | Last Updated 2016-01-12T20:04:27.000Z

  • API

    WDFW-Hatchery Programs

    data.wa.gov | Last Updated 2020-01-23T09:05:09.000Z

    A list of hatchery programs presented in the Salmon Conservation Reporting Engine (SCoRE)

  • API

    Admissions to Juvenile Detention Related to a Status Offense By Status Offender Contempt Charge

    data.wa.gov | Last Updated 2016-01-12T20:03:25.000Z

  • API

    Annual 2013 Water Quality Index Scores

    data.wa.gov | Last Updated 2014-11-18T18:28:21.000Z

    Routine freshwater monitoring data collected by the The WA State Department of Ecology's River and Stream Monitoring Program are summarized by a technique called the "Water Quality Index" (WQI). The WQI ranges from 1 (poor quality) to 100 (good quality). The WQI summary does not include non-standard elements like metals. For temperature, pH, oxygen, and fecal coliform bacteria, the WQI is based on criteria in Washington’s Water Quality Standards, WAC 173-201A. For nutrient and sediment measures where standards are not specific, results are based on expected conditions in a given region. Multiple constituents are combined and results aggregated over time to produce a single score for each station and each year.

  • API

    Voter Precinct to Jurisdiction Crosswalk

    data.wa.gov | Last Updated 2018-04-09T22:30:31.000Z

    The PDC uses this data set for its online web applications to assist the public in finding information relative to a particular jurisdiction. It is provided here for the purpose of assisting application developers and may be of limited interest for the general public. This dataset is a subset (copy) of voter registration records provided to the Public Disclosure Commission by the Washington Secretary of State (SOS) under the terms of SOS and applicable law. Use of this data is governed by any restrictions or limitations of the original release by SOS. By accessing this data you are agreeing to use the data in accordance with the RCW 29A.08.720, RCW 29A.08.740 and RCW 42.56.070(9) and any other applicable law. This data set can be used to correlate a precinct to a PDC jurisdiction and office. These data are provided as-is and may contain errors or omissions. Please refer to the SOS for the most recent precinct data.