The Implications of Nesting in California Redistricting

An IGS Study Funded by

The James Irvine Foundation

On this page, you will find the plans and maps that were developed for this study. We are making them available in different formats and along with the raw data files so that replication of our methods and independent analysis is possible. Below is an explanation of the files. For each plan created, the 8 different files outlined below are available. If you have further questions or do not find what you are looking for, please contact us at karin@cain.berkeley.edu. Thank you

Please note: Plan District Statistics and Equivalency Files are best viewed with Internet Explorer.

Assembly plans

Random box

These plans were drawn without any consideration of racial or political data. Compact and contiguous districts were drawn with equal population.

Ad_randomboxex1 Ad_randomboxex2 File Descriptions
Statewide Map Statewide Map Statewide Map
San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map
Los Angeles Area Map Los Angeles Area Map Los Angeles Area Map
Plan District Statistics Plan District Statistics Plan District Statistics
Census Place Report Census Place Report Census Place Report
County Report County Report County Report
Compactness Report Compactness Report Compactness Report
Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File

"Fully balanced"

These plans attempt to mimic the actual process of redistricting. In these plans, the federal redistricting criteria of equal population, contiguity, and the Voting Rights Act were first considered. Then, race was used to maximize majority-minority seats while minimizing county and city splits.

Ad_fullybalancedex1 Ad_fullybalancedex2 File Descriptions
Statewide Map Statewide Map Statewide Map
San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map
Los Angeles Area Map Los Angeles Area Map Los Angeles Area Map
Plan District Statistics Plan District Statistics Plan District Statistics
Census Place Report Census Place Report Census Place Report
County Report County Report County Report
Compactness Report Compactness Report Compactness Report
Equivalency File / District-Block Assignment File Equivalency File / District-Block assignment File Equivalency File / District-Block Assignment File

"Divided" assembly plans

Random box

These plans were drawn without any consideration of racial or political data. Compact and contiguous districts were drawn with equal population.

Ad_nested_randomboxex1 Ad_nested_randomboxex2 File Descriptions
Statewide Map Statewide Map Statewide Map
San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map
Los Angeles Area Map Los Angeles Area Map Los Angeles Area Map
Plan District Statistics Plan District Statistics Plan District Statistics
Census Place Report Census Place Report Census Place Report
County Report County Report County Report
Compactness Report Compactness Report Compactness Report
Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File

"Fully balanced"

These plans attempt to mimic the actual process of redistricting. In these plans, the federal redistricting criteria of equal population, contiguity, and the Voting Rights Act were first considered. Then, race was used to maximize majority-minority seats while minimizing county and city splits.

Ad_nested_fullybalancedex1 Ad_nested_fullybalancedex2 File Descriptions
Statewide Map Statewide Map Statewide Map
San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map
Los Angeles Area Map Los Angeles Area Map Los Angeles Area Map
Plan District Statistics Plan District Statistics Plan District Statistics
Census Place Report Census Place Report Census Place Report
County Report County Report County Report
Compactness Report Compactness Report Compactness Report
Equivalency File / District-Block Assignment File Equivalency File / District-Block assignment File Equivalency File / District-Block Assignment File

Senate plans

Random box

These plans were drawn without any consideration of racial or political data. Compact and contiguous districts were drawn with equal population.

Sd_randomboxex1 Sd_randomboxex2 File Descriptions
Statewide Map Statewide Map Statewide Map
San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map
Los Angeles Area Map Los Angeles Area Map Los Angeles Area Map
Plan District Statistics Plan District Statistics Plan District Statistics
Census Place Report Census Place Report Census Place Report
County Report County Report County Report
Compactness Report Compactness Report Compactness Report
Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File

"Fully balanced"

These plans attempt to mimic the actual process of redistricting. In these plans, the federal redistricting criteria of equal population, contiguity, and the Voting Rights Act were first considered. Then, race was used to maximize majority-minority seats while minimizing county and city splits.

Sd_fullybalancedex1 Sd_fullybalancedex2 File Descriptions
Statewide Map Statewide Map Statewide Map
San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map
Los Angeles Area Map Los Angeles Area Map Los Angeles Area Map
Plan District Statistics Plan District Statistics Plan District Statistics
Census Place Report Census Place Report Census Place Report
County Report County Report County Report
Compactness Report Compactness Report Compactness Report
Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File

"Aggregated" senate plans

Random box

These plans were drawn without any consideration of racial or political data. Compact and contiguous districts were drawn with equal population.

Sd_nested_randomboxex1 Sd_nested_randomboxex2 File Descriptions
Statewide Map Statewide Map Statewide Map
San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map
Los Angeles Area Map Los Angeles Area Map Los Angeles Area Map
Plan District Statistics Plan District Statistics Plan District Statistics
Census Place Report Census Place Report Census Place Report
County Report County Report County Report
Compactness Report Compactness Report Compactness Report
Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File Equivalency File / District-Block Assignment File

"Fully balanced"

These plans attempt to mimic the actual process of redistricting. In these plans, the federal redistricting criteria of equal population, contiguity, and the Voting Rights Act were first considered. Then, race was used to maximize majority-minority seats while minimizing county and city splits.

Sd_nested_fullybalancedex1 Sd_nested_fullybalancedex2 File Descriptions
Statewide Map Statewide Map Statewide Map
San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map San Francisco / Sacramento Area Map
Los Angeles Area Map Los Angeles Area Map Los Angeles Area Map
Plan District Statistics Plan District Statistics Plan District Statistics
Census Place Report Census Place Report Census Place Report
County Report County Report County Report
Compactness Report Compactness Report Compactness Report
Equivalency File / District-Block Assignment File Equivalency File / District-Block assignment File Equivalency File / District-Block Assignment File


File Descriptions
Statewide Map

Map of all the districts within the state for the plan. Provided as an Adobe PDF document.
*In areas of high population density, the districts may not be visible. The San Francisco/Sacramento area map and the Los Angeles area map will provide closer views of these areas.

San Francisco / Sacramento area Map

This provides a closer view of the districts around the Bay Area Counties: San Francisco , San Mateo, Contra Costa, Alameda, Santa Clara, Solano, and Sacramento. Provided as an Adobe PDF document.

Los Angeles Area Map

This provides a closer view of the districts of lower Los Angeles County , the southwestern tip of San Bernardino County, and Orange County. Provided as an Adobe PDF document.

Plan District Statistics

This file can be opened in Microsoft Excel. It lists the population, deviation from the ideal population, racial breakdown, and political breakdown for each district. The population data contained in this table was taken from the 2000 U.S. Census PL94-171, PL2. Hispanic or Latino, and Not Hispanic or Latino By Race (Table 2) and PL4. Hispanic or Latino, and Not Hispanic or Latino By Race for the Population 18 Years and Over (Table 4). The registration data was taken from the 2000 General Election, Statement of Registration. Refer to the codebook for a description of the variables.

Census Place Report

This file can be opened in Microsoft Word. The first half lists cities and their corresponding districts by county. The second half lists the number of cities and counties by district. Population breakdowns are given for both.

County Report

This file can be opened in Microsoft Word. The first half lists counties and the corresponding district, while the second half lists counties per district. Population breakdowns are given for both.

Compactness Report

This file can be opened in Microsoft Excel. It shows seven measures of compactness: Reock, Schwartzberg, Perimeter, Polsby-Popper, Population Polygon, Population Circle , and Ehrenburg. These measurements are done on a scale of 0 to 1, with 1 being the most compact. The two exceptions are the Schwartzberg and Perimeter measures. The Schwartzberg measure is greater than or equal to 1, with 1 being the most compact. With the Perimeter measure, the smallest total perimeter is the most compact. Calculations are provided per district as well as for the overall plan.

Equivalency File/ District-Block Assignment File

This file can be opened in Microsoft Excel to view the census blocks in each district. This file should be imported into Maptitude to visually view a map of the districts. For instructions, click here.