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 2001 Assembly, Congressional, Senate, and Board of Equalization district of other geographic entities such as census blocks, census tracts, election precincts or zipcodes.
2010 Census Blocks by 2001 Districts:
2000 Census Blocks by 2001 District:
2000 Census Tracts 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.
2002 General Election Precincts by 2001 District:
Zipcodes 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.
2000 Census Blocks by 1991 District: Read the documentation for this file.
2000 Census Blocks by 2000 Block Groups: 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.
2000 Census Block by 2000 Census Place: 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].
1990 Census Block by 2000 Census Tracts: 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.
1990 Census Tract by 2000 Census Tracts: Read the documentation for this file for a description of how to use it.
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