2010 Census Redistricting Data What You Should Know Oregon State Data Center Affiliates November 4, 2010 Portland.

2010 Census Redistricting Data What You Should Know

Oregon State Data Center AffiliatesNovember 4, 2010

Portland

2010 Census DataA Review• Determine apportionment of the U.S. House of

Representatives• Used for congressional and legislative

redistricting• County and city governments use census data

to redraw the boundaries of local political subdivisions including county councils

• Affects the allocation of more than $400 billion in federal funding per year to local, state and tribal governments

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Imagine this December . . .

• Nine short months after data collection began . . . • Apportionment numbers are known• Ideal size of a congressional district is

understood

• ACS 5-year estimates are released, providing characteristics on . . . • State legislative districts • Congressional districts

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Redistricting and the

5-year ACS Estimates

• ACS 5- year estimates will contain demographics for current state legislative districts• Legislators will see recent data for their districts

for the first time since those districts were drawn

• The Block Group data everyone wants may be staggered on an FTP release, a short time after the ACS 5-year release.

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We’re Nearly Done

• P.L. 94-171 redistricting data files are delivered to all states - - no later than March 31, 2011

• Maps and block assignment files released Spring 2011

• Advanced group quarters data released in May 2011 via FTP

• Block group data from the ACS released via FTP a short time after the release of the 5-year estimates

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What’s New on the P.L. Files

• School district summaries• Unified• Secondary• Elementary

• This dramatically increases the size of the files

Per the states’ recommendations following Per the states’ recommendations following Census 2000 we have added:Census 2000 we have added:

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In Addition to School District Summaries . . .

• A new table on housing unit status• Vacant/Occupied

• Four population tables remain the same from previous censuses• Total population• Race • Ethnicity• Voting age

Per the states’ recommendations following Per the states’ recommendations following Census 2000 we have added:Census 2000 we have added:

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Redistricting Data and Supporting Products

• TIGER Line Shapefiles

• Maps

• Block Assignment Files

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What About the Maps?

• Map files for the 2010 Census include:

• P.L. 94-171 County Block Map

• P.L. 94-171 Voting District / State Legislative District (VTD / SLD) Reference Map

• 2010 Census Census Tract Reference Map

• 2010 Census School District Reference Map

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County Block Map: Index Sheet

Sheet 38

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County Block Map – Cropped

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VTD / SLD Reference Map- Cropped

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Census Tract Reference Map - Cropped

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School District Reference Map - Cropped

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County Block Map: Sheet 38

Cropped Area

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Block Assignment Files

• Block Assignment Files (New for 2010)• Congressional• State Legislative • Voting Districts • School Districts (Elementary, Secondary, Unified)• Incorporated Places + Census Defined Places• AIANNH Areas

• Names Look-up Tables• Incorporated Place CDP exception

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Redistricting Data Delivery:How Will This Occur?

• Currently we are collecting the home district / capital district addresses for official recipients including governors and legislative leaders

• Challenges• Time spread of deliveries• Changes resulting from elections

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November Elections

• 37 Governors

• 6,315 legislative elections

• Only MS, VA, NJ and LA without elections this November

• Timing of leadership determination• We must secure names / addresses of

these folks in advance of deliveries

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Redistricting Data DeliveryProcess• As required by law—data must be

delivered in a non-partisan manner• Therefore, we make the following

concurrent shipments• Governors• Majority and minority leaders • Commission directors (when we know who

they are)• Redistricting committees (when we know

who they are)19

Redistricting Data DeliveryNew

• As we ship data to each state we will simultaneously issue an alert to all land- based American Indian Reservations, Alaska Native Village Statistical Areas, Alaska Native Regional Corporations, Oklahoma Tribal Statistical Areas.

• Letters will be sent with a link to our Redistricting Data Program home page, where we will post URLs to the data products that are released - - details in progress

At the request of Race and Ethnic Advisory Committee At the request of Race and Ethnic Advisory Committee

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Redistricting Data Delivery Process for Delivery• Redistricting Data Office (RDO) will

ship Monday thru Thursday

• RDO will confirm bi-partisan receipt Tuesday thru Friday

• DADS will deploy data onto the American FactFinder for immediate public access following confirmation and within 24 hours Wednesday through Saturday

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Redistricting Data DeliveryContents of Shipped Redistricting File

• Population tables (4) including:• Total population• Population by race• Population by ethnicity Hispanic or Latino• Population by Voting Age

• Housing—vacancy status—new for 2010

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Redistricting Data DeliveryProcess for Delivery of Geographic Products

• We will begin delivery of TIGER shapefiles beginning after Thanksgiving and be done by late January before the data come out

• First peek at 2010 tabulation blocks, census tracts, and block groups

• Shapefiles will be posted on GEO homepage

• RDO homepage will post links to all redistricting data including the geo products

• One stop shopping. www.census.gov/rdo 23

What Will the Geographic Summaries Look Like?

• State/County• Census Tract/Block group/tabulation block• Voting District (46 states)• State Legislative District/Congressional

District

• School Districts• Unified / Secondary /Elementary• New for 2010

• American Indian/Alaska Native Areas

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Advance Group Quarters File

• In addition to:– Maps– Shapefiles– Data

• Advance Group Quarters file– To be released by by the Bureau May 2011– Intended to facilitate two programs

Redistricting Count Question Resolution

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May 2011A Review

• Advance Group Quarters File

• Demographic Profiles

• ACS release of 5-year data at the block group level via FTP only-need to watch the initial 5 year release timing

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2010 Census Releases: 2011 - 2013

• Demographic Profiles: May 2011

• Summary File 1: June-August 2011

• Summary File 2: December 2011-April 2012

• Congressional District Summary File for the 113th Congress: January 2013

• Legislative Districts: June 2013

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What Comes Next?Collect Post-2010 Census Redistricting Plans

• 2012-2013

• Collection of newly drawn congressional and legislative district boundaries

• Tabulation of 2010 Census data to those new districts

• Release of data via DVD and AFF

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What Follows Next: Evaluation and Recommendations for 2020 Census

• The “View From the States” will appear in a final publication and will be used to formulate the 2020 Census Redistricting Data Program

• See publication

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For more information on the Redistricting Data Program

www.census.gov/rdowww.census.gov/rdoCheck this site for breaking news

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