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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
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
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.
urban area definitions
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
census 2000 urban areas
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.
2010 urban area program
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.
slide8

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

slide10

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

splitting large urban agglomerations
Splitting Large Urban Agglomerations

Census 2000 San Francisco-Oakland and San Jose Split

slide13

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

slide16

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

slide18

Qualification of Airports for Inclusion in Urban Areas

Merced Municipal/MacCready Field, Merced CA

slide19

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

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slide20

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.

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questions comments
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

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