2020 Census Tracts for King County - Major Waterbody Features Removed

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Frequently anticipated questions:

What does this data set describe?

2020 Census Tracts for King County - Major Waterbody Features Removed
This layer contains a unique geographic identifier (GEO_ID_TRT) for each tract that is the key field for the data from censuses and surveys such as Decennial Census, Economic Census, American Community Survey, and the Population Estimates Program. Data from many of the Census Bureau’s surveys and censuses, are available at the Census Bureau’s public data dissemination website (https://data.census.gov/). All original TIGER/Line shapefiles and geodatabases with demographic data are available atThe TIGER/Line Shapefiles are extracts of selected geographic and cartographic information from the Census Bureau's Master Address File (MAF)/Topologically Integrated Geographic Encoding and Referencing (TIGER) Database (MTDB). The shapefiles include information for the fifty states, the District of Columbia, Puerto Rico, and the Island areas (American Samoa, the Commonwealth of the Northern Mariana Islands, Guam, and the United States Virgin Islands). The shapefiles include polygon boundaries of geographic areas and features, linear features including roads and hydrography, and point features. These shapefiles do not contain any sensitive data or confidential data protected by Title 13 of the U.S.C.Census tracts are small, relatively permanent statistical subdivisions of a county or equivalent entity, and are reviewed and updated by local participants prior to each decennial census. The primary purpose of census tracts is to provide a stable set of geographic units for the presentation of decennial census data. Census tracts generally have a population size of 1,200 to 8,000 people with an optimum size of 4,000 people. The spatial size of census tracts varies widely depending on the density of settlement. Ideally, census tract boundaries remain stable over time to facilitate statistical comparisons from census to census. However, physical changes in street patterns caused by highway construction, new development, and so forth, may require boundary revisions. In addition, significant changes in population may result in splitting or combining census tracts. Census tract boundaries generally follow visible and identifiable features. Census tract boundaries may follow legal boundaries. State and county boundaries always are census tract boundaries in the standard census geographic hierarchy. Census Tract Codes and Numbers—Census tract numbers have up to a 4-character basic number and may have an optional 2-character suffix, for example, 1457.02. The Census Bureau uses suffixes to help identify census tract changes for comparison purposes. Full documentation: https://www2.census.gov/geo/pdfs/maps-data/data/tiger/tgrshp2020/TGRSHP2020_TechDoc.pdf
  1. How should this data set be cited?

    County, King, 20210812, 2020 Census Tracts for King County - Major Waterbody Features Removed: King County, King County, WA.

    Online Links:

    Other_Citation_Details: None

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.542001
    East_Bounding_Coordinate: -121.063188
    North_Bounding_Coordinate: 47.788361
    South_Bounding_Coordinate: 47.073373

  3. What does it look like?

    <http://www5.kingcounty.gov/sdc/DataImages/tracts20_shore.jpg> (JPG)
    JPG File of layer overlain on base of WA counties or local cities

  4. Does the data set describe conditions during a particular time period?

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • GT-polygon composed of chains (494)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet.

      Projection parameters:
      Standard_Parallel: 47.5
      Standard_Parallel: 48.73333333333333
      Longitude_of_Central_Meridian: -120.8333333333333
      Latitude_of_Projection_Origin: 47.0
      False_Easting: 1640416.666666667
      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.00032808333333333333
      Ordinates (y-coordinates) are specified to the nearest 0.00032808333333333333
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    area data table (Source: King County)

    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    Census Bureau code for a state. (Source: King County)

    Census Bureau code for a county. (Source: King County)

    Census Bureau code for a tracts. (Source: King County)

    Unique geographic identifier for a tract. Used as the key field to join tabular data from the Census Bureau. (Source: King County)

    Tract name. (Source: King County)

    (Source: King County)

    (Source: King County)

    (Source: King County)

    (Source: King County)

    Range of values

    (Source: King County)

    Range of values

    (Source: King County)

    (Source: King County)

    (Source: King County)

    Range of values

    Feature geometry. (Source: Esri)

    Coordinates defining the features.

    King County label for census tract. (Source: King County)



    Entity_and_Attribute_Detail_Citation: King County

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    United States Census Bureau

  3. To whom should users address questions about the data?

    King County GIS Center
    Attn: Mary Ullrich
    GIS Specialist
    201 S Jackson St, Suite 225
    Seattle, WA 98104

    206-477-4420 (voice)

Why was the data set created?

2020 United States Census Bureau tract census geography. Converted from Census Bureau TIGER/Line shapefiles and updated to meet King County GIS standards. Major water bodies - Puget Sound, Lake Washington, Lake Sammamaish, and Lake Union have been removed.

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access Constraint: Data is available on GIS Data Portal: <http://www5.kingcounty.gov/gisdataportal/Default.aspx>
Use Constraint: King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.

  1. Who distributes the data set? (Distributor 1 of 1)

    KCGIS Center
    Attn: giscenter@kingcounty.gov
    Data Distribution
    201 S Jackson St
    Seattle, WA 98104

    206-477-4403 (voice)

  2. What's the catalog number I need to order this data set?


  3. What legal disclaimers am I supposed to read?

    Distribution Liability: King County disclaims any warranty of use of any digital product or data beyond that for which it was designed.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 12-Aug-2021
Metadata author:
King County GIS Center
Attn: Mary Ullrich
GIS Specialist
201 S Jackson St, Suite 225
Seattle, WA 98104

206-477-4420 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.12 on Sun Oct 17 12:06:40 2021