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Participant Statistical Areas Program for the 2010 Census

This presentation discusses the participant statistical areas program for the 2010 Census, including census tracts, block groups, census designated places, and census county divisions. It examines the current relevance and use of these geographies, the needs of the data user community, and the validity of existing thresholds. The presentation also explores accommodating ACS data, minimum thresholds for data reporting, and the considerations for the 2010 Census in regards to census tracts, block groups, and special land use tracts and block groups.

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Participant Statistical Areas Program for the 2010 Census

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  1. Participant Statistical Areas Program for the 2010 Census Michael Ratcliffe Indiana GIS Conference March 13, 2007

  2. Participant Statistical Areas • Census Tracts • Block Groups • Census Designated Places • Census County Divisions

  3. Topics Geography Division reexamined • Current relevance and use of these geographies • Needs of the data user community • Validity of existing thresholds • Accommodating ACS data • Minimum thresholds for data reporting • Population vs. housing unit counts • Through: • Geography Division research • Consultation with Census Bureau stakeholders (ACS team leaders, statisticians, and others) • Consultation with non-Census Bureau stakeholders

  4. No substantial changes to criteria • All PSAP geographies are recognizable in: • Concept and purpose • Coding and naming conventions • Boundary features permitted • Thingsdone informally in operational guidelines in the past are made clear and consistent in the criteria

  5. Census Tracts • Nationally consistent small, statistical geographic units • Boundary continuity for data comparability • Data reliability

  6. Census Tracts: Considerations for the 2010 Census • All types of populated tracts meet the same thresholds • National standard • Reliability of sample data • Change minimum population threshold to 1,200 • Reliability of sample data • Avoid application of disclosure avoidance methodologies

  7. Census Tracts: Considerations for the 2010 Census • Housing unit counts or population counts to meet thresholds • Accommodate ACS data Thresholds

  8. Indiana Census Tracts

  9. Census Tracts: Tippecanoe County

  10. Block Groups (BGs) • BGs nest within census tracts • Smallest area for ACS sample data tabulation • Continuity and comparability from one census to another less of a concern

  11. Block Groups:Considerations for the 2010 Census • All types of populated BGs meet the same thresholds • National standard • Reliability of sample data • Increase the minimum thresholds • Sample data reliability • Avoid application of disclosure avoidance methodologies

  12. Block Groups:Considerations for the 2010 Census • Housing unit counts or population counts to meet thresholds • Accommodate ACS data Thresholds

  13. Tracts and Block Groups:Considerations for the 2010 Census • Special land use tracts and block groups • Areas of 1 sq. mile or more within an urban area, 10 sq. miles outside • No residential population • Has an official name • Large public parks, large public forests

  14. Tract and Block Groups: Considerations for the 2010 Census • Special land use areas Central Park, NY 1.3 mi2 Lava Beds National Monument, CA 73 sq mi2 Source: NPS Source: NPS

  15. Tract and Block Groups: Considerations for the 2010 Census • Why define special land use tracts and block groups? • Clarify and cohere current practice • Enhance thematic mapping of data

  16. Tract and Block Groups: Considerations for the 2010 Census • Tribal tracts and tribal block groups • Unique geographic framework separate from the county-based census tracts and block groups that are defined nationwide • Equivalent to county-based census tracts and block groups • Improve data relevance, availability, and reliability for American Indian tribes • Implications: • Standard, county-based census tracts defined nationwide (wall-to-wall coverage) • Tribal tracts are a completely separate set of geography for data presentation purposes

  17. Census Designated Places • Place-level statistics for well-known, settled unincorporated communities; • Statistical equivalents of incorporated places; • Mix of residential, commercial, and retail areas around a nucleus of relatively high residential population density

  18. Census Designated Places:Considerations for the 2010 Census • CDPs cannot have zero population and zero housing units • Zero population and housing units is contrary to the concept of “place” • Not allow CDPs to be defined coextensively with governmentally functioning MCDs in the 12 “strong-MCD” states • Reduce redundancy in data presentations

  19. Number of CDPs and Incorporated Places in the US, Puerto Rico, and the Island Areas: 2000

  20. Distribution of CDPs and Incorporated Places by Population

  21. Indiana Places • Incorporated Places: 567 • Mean Population: 6,851 • Median Population: 1,137 • Census Designated Places: 34 • Mean Population: 3,363 • Median Population: 1,741

  22. Indiana CDPs by Population

  23. Indiana CDPs

  24. Census County Divisions • Set of sub-county units that have stable boundaries and recognizable names; • Provide comparable set of sub-county geographic areas for longitudinal analysis; • Represents one or more communities, trading centers, or major land uses; • Can have more CCDs than census tracts in counties with small populations

  25. Census County Divisions

  26. Census County Divisions:Considerations for the 2010 Census • Options: • Retain the CCD concept • Eliminate the CCD concept and do not replace with another type of sub-county geographic unit

  27. Participant Statistical Areas Program • Regional, multi-county organizations, (e.g. COGs, MPOs) preferred primary participant • To reflect local input and the needs of a wide range of data users • Participation open to all interested parties • MAF/TIGER Participant Software for electronic submission of boundaries

  28. Participant Statistical Areas Program • Proposed criteria published in Federal Register in Spring 2007 • 90 day public review and comment period • Final criteria published late 2007 • Participants identified late 2007 – early 2008 • Materials distributed: Summer 2008 • Participants will have 120 days to review and submit boundaries

  29. Comments and Suggestions? Geographic Standards and Criteria Branch (GSCB) 301-763-3056 April Avnayim, Vince Osier, & Mike Ratcliffe geo.psap.list@census.gov www.census.gov/geo/www/psap2010/psap2010_main.html

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