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.
From this page you can download precinct boundary files and geographic conversion files for the 2018 June Primary Election.
Descriptions of each of these files can be found by following the links below. Please note that the BLK files on this page are based on U.S. Census Bureau 2010 TIGER/Line census blocks.
.cdf
.mif
.shp
2018 General Election Precinct conversions for the 2010 census blocks.
Access the latest versions of data files.
2018 General Election voter registration data and election results by precinct.
Technical documentation regarding the various precinct types.
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