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.
These files can be used to determine the Assembly, Congressional, Senate, and Board of Equalization district of other geographic entities such as census blocks, census tracts, election precincts or ZIP codes.
2010 Census Blocks by 2011 District files
ZIP codes by the new 2011 Assembly, Senate, and Congressional districts. Based on the total number of registered voters' addresses with a given ZIP code that have been geocoded to the district over the total numbers of registered voters with that ZIP code.
In instances where a precinct was split over districts, the precinct was assigned to the district that had the largest number of occurrences of the srprec.
2010 Census Blocks by 2001 Districts
2000 Census Blocks by 2001 District
These files were created to be used with the 2000 SF3 population and housing data. Read the documentation for more information on how to use this file.
A Census place is a U.S. Census Bureau designation for a city or other city like entity.
2002 General Election Precincts by 2001 District
Overlay of the assembly, senate, and congressional districts on a layer of zip code points. Please note that this is based on USPS zipcodes circa 2002.
Read the documentation for this file.
Here is a conversion file (block - block group) for 2000 SF3 population and housing data. Read the documentation for this file for a description of how to use it.
An assignment file for blocks, block groups, tracts to census places. This assignment file includes place names as well as the place code [the other census place conversion and assignment files contain place codes only].
If you have data by 1990 census block, this may be the most convenient way to move into 2000 census tracts. Simply match the block field to the block key and aggregate to the tract id given in the conversion file.
Read the documentation for this file for a description of how to use it.
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