AB 604 - California Congressional Districts 2027-2032 as enacted by Proposition 50

<h3>Summary</h3><p>Congressional District Boundaries from Assembly Bill 604 and certified by the California voters under Proposition 50. These districts will take effect in January 2027 and will remain effect for sitting Congressmembers through 2032. Congressional elections in 2026 will use these districts while Congressional elections in 2032 will use districts newly drawn by the Citizens' Redistricting Commission.</p><p>For the California Assembly's page with more information on the district boundaries and legislation and includes a web map and downloadable file formats, visit <a target='_blank' href='https://aelc.assembly.ca.gov/proposed-congressional-map' rel='nofollow ugc noopener noreferrer'>https://aelc.assembly.ca.gov/proposed-congressional-map</a></p><p><a target='_blank' href='https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB604' rel='nofollow ugc noopener noreferrer'>AB 604 defined districts by explicitly enumerated Census tracts</a>, which went to the ballot as Assembly Constitutional Amendment 8 (ACA-8) and Proposition 50 (Prop 50).</p><p>These districts will be used for elections in the statewide primaries and general election in 2026 and will take effect as the districts for sitting Congressional representatives in January 2027. They will remain in effect sitting representatives through 2032, but elections in 2032 (for districts starting 2033), will use new districts drawn by the Citizens Redistricting Commission basecd on the 2030 Census.</p><p>For boundaries prior to 2026 elections, see <a target='_blank' href='https://gis.data.ca.gov/maps/5bdbecba7641495ba6c7a6939c684105' rel='nofollow ugc noopener noreferrer'>the boundaries produced by the Citizens Redistricting Commission based on the 2020 Census</a>. Those boundaries took effect for elections from 2022 through 2025 and for sitting representatives from 2023 through 2026.</p><p><img style='width:100%;' src='https://sacdtdatadownload.blob.core.windows.net/opendata/ServiceMetadata/CongressionalDistrictsTimeline.png' alt='A timeline based representation of the periods of validity for districts, showing their use for both elections and as boundaries for sitting representatives. For the actual details conveyed in this image, please see the prior paragraph, which includes the specific dates conveyed on the timeline as text.' /></p><p>&nbsp;</p><h3>Related Layers</h3><p>This layer does not include elected membership information, and was not drawn by the Citizens' Redistricting Commission.</p><ol><li><a target='_blank' href='https://gis.data.ca.gov/maps/5bdbecba7641495ba6c7a6939c684105' rel='nofollow ugc noopener noreferrer'>2020 Census-based boundaries from the Citizens Redistricting Commission</a>.&nbsp;</li><li><a target='_blank' href='https://gis.data.ca.gov/search?groupIds=8f682c356c8e49909321bee95ad19356' rel='nofollow ugc noopener noreferrer'><u>All boundaries, including state-level legislative districts</u></a> as drawn by the Citizens Redistricting Commission following the 2020 Census, effective for elections from 2022-2025 and in effect for sitting Congressmembers from 2023-2026.</li><li>Current <a target='_blank' href='https://gis.data.ca.gov/datasets/California::ca-congress-districts-and-membership-2024-2026/about' rel='nofollow ugc noopener noreferrer'><u>district boundaries</u></a> and membership, maintained by USDOT. This layer is updated with district boundaries and membership as they change and is useful for those who need an always-current source.</li></ol><p>California Department of Technology's GIS Team works with the Senate Demographer to publish authoritative data for both the Citizens Redistricting Commission (We Draw the Lines) and the legislative sources of district boundaries.</p><p>&nbsp;</p><h3>Field and Abbreviation Definitions</h3><p>The data fields were developed by the Assembly based on the source data from the <a target='_blank' href='https://statewidedatabase.org/redistricting2021/counties.html#' rel='nofollow ugc noopener noreferrer'>Statewide Redistricting Database</a>. &nbsp;Questions about methodology to transform the data should be directed to the Assembly Democratic Caucus.<br />&nbsp;</p><ul><li><strong>A_POP: </strong>Adjusted Population</li><li><strong>ASN_CVAP: </strong>Asian citizens of voting age population</li><li><strong>ASN_CVAP_P: </strong>Asian citizens of voting age population percentage</li><li><strong>BLK_CVAP: </strong>Black or African American citizens of voting age population</li><li><strong>BLK_CVAP: </strong>Black or African American citizens of voting age population percentage</li><li><strong>CVAP: </strong>Citizens of voting age population</li><li><strong>CVAP_PCT: </strong>Citizens of voting age population percentage</li><li><strong>DEVIATION:</strong> Difference from ideal district population total (760,066) - either -1, 0, or 1</li><li><strong>DISTRICT: </strong>Congressional District</li><li><strong>HSP_CVAP: </strong>Hispanic or Latino citizens of voting age population</li><li><strong>HSP_CVAP_P: </strong>Hispanic or Latino citizens of voting age population percentage</li><li><strong>IND_CVAP: </strong>American Indian or Alaskan Native citizens of voting age</li><li><strong>IND_CVAP_P: </strong>American Indian or Alaskan Native citizens of voting age percentage</li><li><strong>WHT_CVAP: </strong>White citizens of voting age population</li><li><strong>WHT_CVAP_P: </strong>White citizens of voting age population percentage</li></ul><h3>Accuracy</h3><p>CDT is providing these districts exactly as they are developed by the California State Assembly. The legal definitions of the districts are as explicitly enumerated in the source legislation. We have been informated that the boundaries here may have been processed, simplified, or reprojected in ways that can impact the edges in meaningful ways. We are currently unable to estimate the scale accuracy of the dataset and while they are likely suitable for many uses, care should be exercised if differences near boundary lines are meaningful in data you use with these boundaries.</p><p>Those requiring very accurate boundaries may wish to consult the legislation, or <a target='_blank' href='https://aelc.assembly.ca.gov/proposed-congressional-map' rel='nofollow ugc noopener noreferrer'>the block equivalency file provided by the Assembly</a> to then join to a known accurate source of Census blocks.</p><h3>Additional Resources</h3><p>Additional information can be accessed on the Senate Office of Demographics webpage.<br /><a target='_blank' href='https://sdmg.senate.ca.gov/committeehome/2025-congressional-districts' rel='nofollow ugc noopener noreferrer'><u>https://sdmg.senate.ca.gov/committeehome/2025-congressional-districts</u></a></p>