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Census 2010 P.L. 94-171 Redistricting Data

The P.L. 94-171 redistricting data (about) are an important component of Census 2010. These are the first geographic and demographic more detailed data to be released from Census 2010. They provide the first opportunity to analyze "current" small area demographics and change since 2000. These data are the foundation of many redistricting operations, far broader than congressional reapportionment/redistricting. The data provide geographic relationship codes new for Census 2010.

The P.L. 94-171 data files contain summary data down to the census block geographic level. The interactive ranking table below provides summary data at the state, congressional district, county, city/place and school district levels for all states and D.C.

Integrating Census 2010 shapefiles and Census 2010 demographics with GIS:
  ... census block multicultural site analysis ... view examples at right.

Census 2000-2010 Population & Change Interactive Ranking Tables
... School Districts ... Counties ... Metros ... States

Census 2010 Multi-Geo Demographics Interactive Ranking Table
  Click ShowAll button to show all tabulation areas.
  Select State using State drop-down; click ShowAll between state selections.
  Click column header to sort; click again to sort other direction.
  More usage/content notes below table. See related Ranking Tables Main Page.
  All population percentages use total population as denominator.
  Use mouseover on header to view tooltip description of column content.
  Data available as CSV file. Contact Proximity; mention 'PL94171 CSV file'.



Usage notes ...
Demographic column headers are abbreviations for database item names shown in the table "P.L. 94-171 Subset Database Items" presented below. In the column headers, a decimal point (".") is used as a place holder for "00" item name shown in the table. For example, the column header "P.1.2%" is the percent item P001002 (see table below -- Population of one race) of total population (P001001). All population percentages use total population as the denominator.

Content of table ...
Proceeding across columns, there is a set of columns for:
  • housing units,
  • total population by race and ethicity,
  • population 18 years and over by race and ethnicity.


Viewing a specific summary level ...
To view only congressional districts (school districts, counties, places ) for a selected state:
  • Click ShowAll button.
  • Use dropdown to select state.
  • Use dropdown to select summary level.
  • Rank on a selected column by clicking header on that column.
  • Rank in other direction by clicking same header again.

Using Find CBSA ... examining metro data ...
CBSA is the abbreviation for Core-Based Statistical Area.
A CBSA is a Metropolitan Statistical Area (MSA) or a Micropolitan Statistical Area (MISA).
Use Find CBSA to show all counties in the CBSA. CBSA totals are not presented in this table.
Steps:
  • Click ShowAll button.
  • Enter the exact 5-digit CBSA code in the box to the right of "Find CBSA".
    -- use this list to locate the CBSA code.
    -- the default value shown, 49700, is the Washington, DC CBSA code.
  • Click "Find CBSA".
  • If no data are shown, 1) ShowAll button was not clicked first or 2) there are no counties for this CBSA code in the table.

Data shown correspond to counties that are within this CBSA.
Only county level data are shown in the table for the CBSA.
Click on any column header to sort on that item.

To view non-metro counties, use the CBSA code 99999.

Browser notes ...
This page is best viewed with a display device/screen with at least 1600 pixel width. Under most circumstances all ranking table operations will perform better/faster with Firefox compared to Internet Explorer. In addition, Firefox users may open the browser window to full screen and use a horizontal scrollbar (at bottom of screen and not available on IE) making the table easier to use with sub-1600 pixel width screens ... and access the ranking table vertical scroll bar to the far right of the ranking table.

See P.L. 94-171 Redistricting Data Technical Documentation for details: http://proximityone.com/cen2010/pl94-171.pdf

GeoDemographic Analysis & National Scope Shapefiles
... Geographic Information Systems, P.L. 94-171, TIGER/Line & geodemographic analysis ... concurrent with release of the P.L. 94-171 data will be the release of the Census 2010 TIGER/Line shapefiles. These shapefiles contain Census 2010 boundaries but are not integrated with subject matter data. Proximity provides Census 2010 shapefiles with integrated P.L 94-171 data that enable wide-ranging geospatial analysis. Integrate your own subject matter data and geography with these shapefiles.

U.S. National Scope Boundary Shapefiles by:
  U.S. & State   Core-Based Statistical Area   City/Place   ZIP Code Area
  Congressional District   Metropolitan Division   County Subdivision   Census Tract
  County   Urbanized Area/Urban Cluster 1   School District   Census Block Group
    Urban Cluster 1   School Attendance Zone 1   Census Block

1 Urbanized Area (UA), Urban Cluster (UC) and ZIP Code Tabulation Area (ZCTA) boundaries will be defined at a later date by the Census Bureau. Provisional UA and UC boundary files will be developed by Proximity in early 2011, using methodology similar to Census 2000. See more about Census 2010 urban areas. ZIP Code Area (ZCA), similar to ZCTA, boundaries will be developed by Proximity in early 2011. School Attendance Zones, not developed by the Census Bureau, will be developed in early 2011. More information about these boundary files is provided in the GeoBase description.

P.L. 94-171 Subset Database Items (for optional integration with above shapefiles)

Items shown in the following table are a subset of full detail P.L. 94-171 (see description below)
Total Population (from Table P1)
P001001Total:
P001002   Population of one race:
P001003     White alone
P001004     Black or African American alone
P001005     American Indian and Alaska Native alone
P001006     Asian alone
P001007     Native Hawaiian and Other Pacific Islander alone
P001008     Some other race alone
P001009   Population of two or more races:

Hispanic or Latino, and Not Hispanic or Latino by Race (from Table P2)
P002001Total:
P002002  Hispanic or Latino
P002003  Not Hispanic or Latino:
P002004    Population of one race:
P002005      White alone
P002006      Black or African American alone
P002007     American Indian and Alaska Native alone
P002008     Asian alone
P002009     Native Hawaiian and Other Pacific Islander alone
P002010     Some other race alone
P002011   Population of two or more races:

Population 18 Years and Over (from Table P3)
P003001Total:
P003002   Population of one race:
P003003     White alone
P003004     Black or African American alone
P003005     American Indian and Alaska Native alone
P003006     Asian alone
P003007     Native Hawaiian and Other Pacific Islander alone
P003008     Some other race alone
P003009   Population of two or more races:

Population 18 Years and Over: Hispanic or Latino, and Not Hispanic or Latino by Race (from Table P4)
P004001Total:
P004002  Hispanic or Latino
P004003  Not Hispanic or Latino:
P004004    Population of one race:
P004005      White alone
P004006      Black or African American alone
P004007     American Indian and Alaska Native alone
P004008     Asian alone
P004009     Native Hawaiian and Other Pacific Islander alone
P004010     Some other race alone
P004011   Population of two or more races:

Housing Units (Table H1)
H001001Total:
H001002   Occupied
H001003   Vacant

P.L. 94-171 File Structure & Data Organization
The Census sourced file structure is comprised of a geographic segment and two data segments. These three segments are provided for each tabulation area; e.g. census block. The three segments may be chained together based on the Logical Record Number field. Fields in the geographic segment are shown below (toggle). Not all geographic segment fields are populated with the initial release of the files. The Status column shows NA (not available) for these fields.

Geographic Segment Fields   View (toggle)

The geographic tabulation summary level is carried as the third item in the geographic segment (see above). This field is used to identify the type of geography in the corresponding data record.

Geographic Tabulation Summary Levels   View (toggle)

The two data segments contain 288 subject matter items tabulated for each census block and each higher level geography area summarized above. Data items are organized into 4 population tables and 1 housing table as described below. The same set of 71 subject matter categories are used for tables P1 and P2, differing only by universe of tabulation. Similarly, the same set of 73 subject matter categories are used for tables P3 and P4, differing only by universe of tabulation. There are no gender-based tabulations. Age-related data is provided only for the population 18 years and over, making it possible to derive data for the population under 18 years of age. Gender and other age-related data are available from Summary File 1 and Summary File 2.

Data Segment 1 contains Tables P1 and P2

P1. Population by Race [71 items]
Universe: Total population
  View (toggle)

P2. Hispanic or Latino, and Not Hispanic or Latino by Race [73 items]
Universe: Total population
  View (toggle)

Data Segment 2 contains Tables P3, P4 and H1

P3. Race for the Population 18 Years and Over [71 items]
Universe: Total population 18 years and over
  View (toggle)

P4. Hispanic or Latino, and Not Hispanic or Latino by Race for the Population 18 Years and Over [73]
Universe: Total population 18 years and over   View (toggle)

H1. Occupancy Status [3]
Universe: Housing units
  View (toggle)

About the P.L. 94-171 Data [goto top]
Public Law 94-171 (P.L. 94-171) specifies that within 1 year of Census Day, the Census Bureau must send each state the small-area data the state will need to redraw districts for the state legislature.

P.L. 94-171 sets up a voluntary program between the Census Bureau and those states that wish to receive population tabulations for voting districts and other state-specified geographic areas. Under this program, those responsible for the legislative apportionment or redistricting of each state may devise a plan identifying the voting districts for which they want the specific tabulations and submit it to the Census Bureau.

The Census 2010 Redistricting Data Program is a multi-phase program. During Phase 1 (2005-2006), Census collected state legislative district boundaries and associated updates to tabulate legislative districts. In a Phase 2 (2008-2010, Voting District/Block Boundary Suggestion Project, received TIGER/Line shapefiles and software to electronically collect voting district boundaries, feature updates, suggested block boundaries, and corrected state legislative district boundaries. Phase 1 and Phase 2 are voluntary programs that optionally includes state verification of submitted data.

In Phase 3 Census delivers the geographic and data products to the majority and minority leadership in the state legislatures, the governors, and any designated P.L. 94-171 liaisons. Once bipartisan receipt of the data is confirmed, the data will be made available online to the public within 24 hours. States can then begin their redistricting. States are responsible for delineating their own congressional and legislative boundaries and their legislatures. Legislatures, secretaries of state, governors, and/or redistricting commissions carry out the process.

In Phase 4 (2011-2013) the Census Bureau will collect the post-2010 Census state legislative and congressional district plans. Data will be retabulated the 2010 redistricting data for the 113th Congress and newly drawn state legislative districts. The American Community Survey (ACS) will also present data for these new areas.

Additional Information
Proximity develops geodemographic-economic data and analytical tools and helps organizations knit together and use diverse data in a decision-making and analytical framework. We develop custom demographic/economic estimates and projections, develop geographic and geocoded address files, and assist with impact and geospatial analyses. Wide-ranging organizations use our resources (software, data, methodologies) to analyze their own data integrated with other data.


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