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    Harvard Government 90dn Lecture 4

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    The document discusses the major geographical units used by the US Census Bureau, including blocks, census tracts, counties, metropolitan areas, and urban/rural classifications, and how their boundaries are defined. It also covers how data can be compared across these different units over time using tools from the Census Bureau that allow geographic correspondence between units from different years. The units are hierarchical, with smaller units like blocks nested within larger units like counties.

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    Harvard Government 90dn Lecture 4

    Uploaded by

    J
    70 views13 pages
    The document discusses the major geographical units used by the US Census Bureau, including blocks, census tracts, counties, metropolitan areas, and urban/rural classifications, and how their boundaries are defined. It also covers how data can be compared across these different units over time using tools from the Census Bureau that allow geographic correspondence between units from different years. The units are hierarchical, with smaller units like blocks nested within larger units like counties.

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    The document discusses the major geographical units used by the US Census Bureau, including blocks, census tracts, counties, metropolitan areas, and urban/rural classifications, and how their boundaries are defined. It also covers how data can be compared across these different units over time using tools from the Census Bureau that allow geographic correspondence between units from different years. The units are hierarchical, with smaller units like blocks nested within larger units like counties.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    70 views13 pages

    Harvard Government 90dn Lecture 4

    Uploaded by

    J
    The document discusses the major geographical units used by the US Census Bureau, including blocks, census tracts, counties, metropolitan areas, and urban/rural classifications, and how their boundaries are defined. It also covers how data can be compared across these different units over time using tools from the Census Bureau that allow geographic correspondence between units from different years. The units are hierarchical, with smaller units like blocks nested within larger units like counties.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 13

    Government 90dn

    Mapping the Census

    Lecture 4: Geographical Units

    Sumeeta Srinivasan
    ssrinivasan@cga.harvard.edu
    Outline for Today
    ƒ Geographical Units in Census
    ƒ How to compare across time/ space
    ƒ Discussion
    Major Units: Blocks, Census Blocks, Tracts
    Source: http://www.census.gov/geo/www/geo_defn.html

    ƒ Blocks, Block groups, tracts do not cross the


    boundaries of any entity for which the U.S.
    Census Bureau tabulates
    ƒ Tabulation blocks are identified uniquely within
    census tract and block groups
    ƒ Census 2000 collection blocks, block groups
    and tracts are numbered uniquely within county
    (or statistically equivalent entity)
    Major Units: Counties
    Source: http://www.census.gov/geo/www/geo_defn.html

    ƒ The primary legal divisions of most states are


    termed counties.
    ƒ In Louisiana, these divisions are known as
    "parishes"
    ƒ In Alaska, statistically equivalent entities are
    organized boroughs and the census areas
    ƒ Maryland, Missouri, Nevada, and Virginia have
    one or more incorporated places that are
    independent cities
    ƒ DC is one county
    Major Units: County subdivisions
    Source: http://www.census.gov/geo/www/geo_defn.html

    ƒ Census county divisions CCD, census subareas,


    minor civil divisions MCD, and unorganized
    territories
    ƒ The boundaries of CCD, MCD etc. follow visible
    features, and coincide with census tracts where
    applicable
    ƒ CCD delineated by Census – 21 states (includes
    Alabama)
    ƒ MCDs are the governmental or administrative
    divisions of a county in 28 states (includes Mass.)
    Counties and County Subdivisions
    Major Units: Metropolitan Areas
    Source: http://www.census.gov/geo/www/geo_defn.html

    ƒ Concept of a metropolitan area (MA): large population nucleus,


    with communities that have economic/ social integration
    ƒ Each MA must contain a place with minimum population 50,000
    or a U.S. Census Bureau-defined urbanized area
    ƒ An MA contains one or more central counties (with specified
    level of commuting)
    ƒ Classified as:
    ƒ Metropolitan statistical area (MSA) or
    ƒ Consolidated metropolitan statistical area (CMSA) divided into primary
    MSA (PMSAs)
    ƒ If MA has more than 1 million people 2 or more PMSAs may be
    defined
    Metropolitan Areas
    ƒ Each MSA, PMSA and CMSA was assigned a unique 4-digit
    FIPS code, inherited usually from Standard Metropolitan
    Statistical Areas SMSA of the same or similar name in previous
    Census.
    ƒ For Massachusetts:
    Major Units: Places
    Source: http://www.census.gov/geo/www/geo_defn.html

    ƒ Place is a concentration of population


    ƒ Include census designated places CDP, consolidated cities, and
    incorporated place
    ƒ CDPs are delineated to provide data for population that are
    identifiable by name but are not legally incorporated
    ƒ A consolidated city is a unit for which the functions of an
    incorporated place and its county or MCD merged
    ƒ An incorporated place is established for governmental functions
    for a concentration of people as opposed to a MCD created to
    provide services or administer an area without regard to
    population
    Places
    Major Units: Urban or Rural
    Source: http://www.census.gov/geo/www/geo_defn.html

    ƒ U.S. Census classifies as urban all territory,


    population, and housing units located within an
    urbanized area (UA) or an urban cluster (UC)
    ƒ An urban cluster (UC) consists of densely settled
    territory that has at least 2,500 people but fewer than
    50,000 people
    ƒ An urbanized area (UA) consists of densely settled
    territory that contains 50,000 or more people. A UA
    may contain both place and nonplace territory
    UA and UC
    ƒ For Massachusetts:
    Comparing across geographic unit
    and time
    ƒ Across time:
    http://mcdc2.missouri.edu/websas/geocorr2k.ht
    ml
    ƒ Across unit:
    http://www.census.gov/popest/geographic/bound
    ary_changes/

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