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Proposed Urban Area Criteria for the 2010 Census

Proposed Urban Area Criteria for the 2010 Census. Michael Ratcliffe Geography Division U.S. Census Bureau Let’s Focus on Census Geography Workshop GIS-T April 11, 2010. Urban and Rural Classification.

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Proposed Urban Area Criteria for the 2010 Census

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  1. Proposed Urban Area Criteria for the 2010 Census Michael Ratcliffe Geography Division U.S. Census Bureau Let’s Focus on Census Geography Workshop GIS-T April 11, 2010

  2. Urban and Rural Classification • The Census Bureau identifies and classifies urban and rural areas after each decennial census. • Urban areas of at least 2,500 people have been identified since 1906. • Urbanized areas of 50,000 or more people were first defined for the 1950 Census. Urban places of at least 2,500 people were identified outside urbanized areas. Urban clusters of 2,500 - 49,999 were first defined after Census 2000. • The Census Bureau identifies urban and rural areas solely for the purpose of tabulating and presenting statistical data.

  3. Urban Area Definitions • Represent densely developed territory, encompassing residential, commercial, and other non-residential urban land uses in which social and economic interactions occur. • Represent the “Urban Footprint” • Structure has been explicitly defined through measures based primarily on population counts and residential population density • Criteria have also accounted for non-residential urban land uses that are functionally part of the urban landscape

  4. Census 2000 Urban Areas • For Census 2000, an urban area consists of a densely settled core created from census block groups, census blocks, and the adjacent densely settled surrounding territory that together have a minimum population of 2,500 people • Two types of urban areas: • urbanized areas of 50,000 or more population; • urban clusters of 2,500 – 49,999.

  5. Census 2000 Basic Urban Core Delineation

  6. Census 2000 Basic Urban Core Delineation

  7. 2010 Urban Area Program • Remain committed to an objective, equitable, and consistent nationwide urban area delineation. • Retain decennial comparability by building upon 2000 criteria. • All potential modifications are refinements, or supplements to address deficiencies encountered for Census 2000.

  8. Initial Core Using Census Tract Analysis Units Qualifying census tract ≥ 1,000 ppsm 560 ppsm 800 ppsm Qualifying census tract ≥ 500 ppsm contiguous to initial core 550 ppsm Census tract not contiguous to an initial core census tract ≥ 1,000 ppsm Census tract > 3 sq. miles 1,600 ppsm 1,300 ppsm 700 ppsm Initial Census Tract Core Based on Population and Size Criteria 750 ppsm

  9. Initial Core Using Census Tract Analysis Units Qualifying census tract ≥ 1,000 wpsm 560 wpsm 800 wpsm Qualifying census tract ≥ 500 ppsm contiguous to initial core 550 wpsm Census tract not contiguous to an initial core census tract ≥ 1,000 wpsm Census tract > 5 sq. miles and < 15 sq. miles 1,600 wpsm 15,000 workers And 1,200 wpsm 1,300 wpsm Initial Census Tract Core Based on Employment and Size Criteria 750 wpsm

  10. Initial Core Test Delineation Regions

  11. Splitting Large Urban Agglomerations Census 2000 San Francisco-Oakland and San Jose Split

  12. Splitting Large Urban Agglomerations Using Commuting Patterns Commuting core A ≥ 50,000 persons Commuting core B ≥ 50,000 persons Urban area A after split Largest worker flow to commuting core A Largest worker flow to commuting core B No commuting association and largest adjacency with urban area B Urban split Urban area B after split

  13. Concord/Livermore UA Split

  14. Boundary Using Proposed Impervious Criteria

  15. Wetlands as an Additional Exempted Territory Noncontiguous qualifying territory Jump census block Urban Core Road connection Distance from core to wetlands is 0.7 mile Distance over wetlands is 0.5 mile Total exempted distance is 1.8 miles Total jump distance is 3.2 miles Distance over river is 0.6 mile Distance over wetlands is 0.7 mile Distance from wetlands to noncontiguous qualifying area is 0.7 mile

  16. Steep Slope as Exempted Territory

  17. Qualification of Airports for Inclusion in Urban Areas Merced Municipal/MacCready Field, Merced CA

  18. Prison Urban Clusters Abilene North (Robertson Unit), TX Population: 4,650 Urban: 4,650 Group Quarters: 4,650 Institutional: 4,650 Correctional: 4,650 Density: 94,589 ppsm 19

  19. Central Places • Central places are not necessary for UA or UC delineation • Principal cities defined within CBSAs: • capture same concept • classification based on different criteria • Lack of consideration of place boundaries in delineation process results in central places split between urban and rural portions. 20

  20. Questions? Comments? Vincent Osier Chief Geographic Standards and Criteria Branch Geography Division U.S. Census Bureau Vincent.osier@census.gov (301) 763-9039 Chris Henrie Geographic Standards and Criteria Branch Geography Division U.S. Census Bureau christopher.j.henrie@census.gov (301) 763-9086 21

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