Each redistricting dataset merges the electoral data the SWDB collected and processed over the preceding decade with the most current census data (PL94-171). The result is a census block level dataset that allows for longitudinal analysis of electoral data over time on the same unit of analysis. Electoral data consist of the Statements of Vote (SOV) and Statements of Registration (SOR) for each statewide election. These data are collected from the Registrars of Voters for each of the 58 California counties with each election.
The SWDB collects the Statement of Vote and the Statement of Registration along with various geography files from each of the 58 counties for every statewide election. The Statement of Vote is a precinct level dataset and precincts in California change frequently between elections. The goal of the SWDB is to make election data available that can be compared over time, on the same unit of analysis – a precinct, a census block or a census tract.
Voting, registration, and geographic data sets for statewide elections beginning in 1992.
Welcome to the Statewide Database, California's redistricting database. We are responsible for collecting and processing data for California's decennial redistricting. In 2001 and 2011, these data were used for Assembly, Senate, Congressional, Board of Equalization, and local redistrictings, as mandated by law. Data collection and processing are ongoing between redistrictings, with precinct level datasets and resources published after each election.
After every statewide election we publish voter registration and voting reports at the precinct level. In addition we create digitized precinct boundary files and data conversion tables. Our data conversion tables make it possible to convert a dataset from one geographic unit to another, for example between precincts and census blocks. These resources can be found under the Election tab.
After each Decennial Census, the Census Bureau provides a census block level redistricting dataset as per Public Law 94-171. We merge the census data with the Statements of Registration and Vote from the previous decades' statewide elections to create a block level dataset that allows for analysis of all three datasets on the same unit of analysis: the census block. Explore the Redistricting tab to find these datasets and other documents from past redistrictings.
Assembly, Congressional, Senate, and Board of Equalization District maps, certified by the Citizens Redistricting Commission, are hosted here as well. They can be found as well under the Redistricting tab as an interactive map or in a variety of geographic formats.
Please use our Contact Us or call us at (510) 642-9086 if you would like our assistance with any project concerning our data. We also welcome your feedback on this site. Thank you!
Here are some quick links to help you get started on finding what you need.
Voting, registration, and geographic data sets for the State of California.
Data for statewide Primary,General and Special Elections.
Learn about where files are located and how to import and use the data.
Follow the links to access new uploads and the latest versions of data files.
The 2014 Primary Election geography files have been updated for Amador county.
The 2014 Primary Election geography files have been updated for Solano county.
The 2018 General Election data and geography files have been updated for Riverside county.
The 2018 General Election data and geography files have been updated for Placer county.
The 2018 General Election data and geography files have been updated for Orange county.
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