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  1. Title: USA (Core Based Statistical Areas CBSA, 2003)

    • Polygon data
    • 2008
    Contributors:

    Summary: The United States Core Based Statistical Areas (CBSA) Boundaries data set contains the boundaries for metropolitan and micropolitan statistical areas in the United States. The data set contains information on location, identification, and size. The database includes metropolitan and micropolitan boundaries within all 50 states, the District of Columbia, and Puerto Rico.Combined statistical areas are groupings of adjacent metropolitan and/or micropolitan statistical areas that have social and economic ties as measured by commuting to work, but at lower levels than are found among counties within individual metropolitan and micropolitan statistical areas. Combined statistical areas can be characterized as representing larger regions that reflect broader social and economic interactions, such as wholesaling, commodity distribution, and weekend recreation activities, and are likely to be of considerable interest to regional authorities and the private sector. Each metropolitan or micropolitan statistical area consists of a core area containing a substantial population nucleus, together with adjacent communities having a high degree of economic and social integration with that core. Metropolitan statistical areas contain at least one U.S. Census Bureau-defined urbanized area of 50,000 or more population; micropolitan statistical areas contain at least one Census Bureau-defined urban cluster of at least 10,000 and less than 50,000 population. If specified criteria are met, a metropolitan statistical area containing a single urbanized area with a population of 2.5 million or more may be subdivided into metropolitan divisions, which function as distinct social and economic areas within the larger metropolitan statistical area.

  2. Title: USA (109th Congressional Districts, 2005)

    • Polygon data
    • 2005
    Contributors:

    Summary: The 109th Congressional District Boundaries data set contains geographic information for the political entities of the 109th Congressional districts.

  3. Title: USA (108th Congressional Districts, 2003)

    • Polygon data
    • 2003
    Contributors:

    Summary: The 108th Congressional District Boundaries data set contains geographic information for the political entities of the 108th Congressional districts.

  4. Title: USA (107th Congressional Districts, 2001)

    • Polygon data
    • 2001
    Contributors:

    Summary: The 107th Congressional District Boundaries data set contains geographic information for the political entities of the 107th Congressional districts.

  5. Title: USA (106th Congressional Districts, 1999)

    • Polygon data
    • 1999
    Contributors:

    Summary: The 106th Congressional District Boundaries data set contains geographic information for the political entities of the 106th Congressional districts.

  6. Title: USA (105th Congressional Districts, 1997)

    • Polygon data
    • 1997
    Contributors:

    Summary: The 105th Congressional District Boundaries data set contains geographic information for the political entities of the 105th Congressional districts.

  7. Title: USA (104th Congressional Districts, 1995)

    • Polygon data
    • 1995
    Contributors:

    Summary: The 104th Congressional District Boundaries data set contains geographic information for the political entities of the 104th Congressional districts.

  8. Title: USA (103rd Congressional Districts, 1993)

    • Polygon data
    • 1993
    Contributors:

    Summary: The 103rd Congressional District Boundaries data set contains geographic information for the political entities of the 103rd Congressional districts.

  9. Title: U.S. Census Populated Place Areas, 2017

    Contributors:

    Summary: U.S. Census Populated Place Areas represents populated place areas within the United States that include both incorporated places and census designated places identified by the U.S. Census Bureau.

  10. Title: U.S. Census Block Groups, 2017

    Contributors:

    Summary: U.S. Census Block Groups represents the Census block groups of the United States in the 50 states, the District of Columbia, and Puerto Rico.

  11. Title: U.S. Counties, 2017

    Contributors:

    Summary: U.S. Counties represents the counties of the United States in the 50 states, the District of Columbia, and Puerto Rico.

  12. Title: U.S. Census Tracts, 2017

    Contributors:

    Summary: U.S. Census Tracts represents the Census tracts of the United States in the 50 states, the District of Columbia, and Puerto Rico.

  13. Title: U.S. Core Based Statistical Areas, 2017

    Contributors:

    Summary: U.S. Core Based Statistical Areas represents geographic entities, defined by the United States Office of Management and Budget (OMB) for use by Federal statistical agencies, based on the concept of a core area with a large population nucleus, plus adjacent communities having a high degree of social and economic integration with that core. A Core Based Statistical Area (CBSA) consists of a U.S. county or counties or equivalent entities associated with at least one urban core (urbanized area or urban cluster) with a population of at least 10,000 along with any adjacent counties having a high degree of social and economic integration with the core as measured through commuting ties with the counties containing the core. CBSAs are categorized as being either Metropolitan or Micropolitan. Each Metropolitan Statistical Area must have at least one urbanized area of 50,000 or more inhabitants. Each Micropolitan Statistical Area must have at least one urban cluster with a population of at least 10,000 but less than 50,000.

  14. Title: U.S. States (Generalized), 2017

    Contributors:

    Summary: U.S. States (Generalized) represents the 50 states and the District of Columbia of the United States.

  15. Title: U.S. Cities, 2017

    Contributors:

    Summary: U.S. Cities represents the locations of cities within the United States with populations of approximately 10,000 or greater, all state capitals, and the national capital.

  16. Title: U.S. States, 2017

    Contributors:

    Summary: U.S. States represents the 50 states, the District of Columbia, and Puerto Rico of the United States.

  17. Title: U.S. Counties (Generalized), 2017

    Contributors:

    Summary: U.S. Counties (Generalized) represents the counties of the United States in the 50 states and the District of Columbia.

  18. Title: U.S. Census Populated Place Points, 2017

    Contributors:

    Summary: U.S. Census Populated Place Points represents populated place locations within the United States that include both incorporated places and census designated places identified by the U.S. Census Bureau.

  19. Title: U.S. Populated Place Areas, 2013

    Contributors:

    Summary: U.S. Populated Place Areas represents populated place areas within the United States that include both incorporated places and census designated places identified by the U.S. Census Bureau.

  20. Title: Census Block Groups, 2000 - San Francisco Bay Area, California

    Contributors:

    Summary: This polygon shapefile displays U.S. Census Block Groups for the San Francisco Bay Area in California as of January 1, 2000. Block Groups (BGs) are clusters of blocks within the same census tract having the same first digit of their 4-digit census block number. For example, block group 3 (BG 3) within a census tract includes all blocks numbered from 3000 to 3999. Census 2000 BGs generally contain between 600 and 3,000 people, with an optimum size of 1,500 people. Most BGs were delineated by local participants in the U.S. Census Bureau's Participant Statistical Areas Program. The U.S. Census Bureau delineated BGs only where a local or tribal government declined to participate or where the U.S. Census Bureau could not identify a potential local participant.A BG usually covers a contiguous area. Each census tract contains at least one BG and BGs are uniquely numbered within census tract. Within the standard census geographic hierarchy BGs never cross county or census tract boundaries, but may cross the boundaries of county subdivisions, places, urbanized areas, voting districts, congressional districts, and American Indian/Alaska Native areas/Hawaiian home lands. Under the Census 2000 American Indian/Alaska Native area/Hawaiian homeland census geographic hierarchy, census tracts and BGs are defined within American Indian entities and can cross state and county boundaries. These are commonly referred to as Tribal BGs.BGs have a valid range of 0 through 9. BGs beginning with a 0 generally are in coastal and Great Lakes water and territorial seas. Rather than extending a census tract boundary into the Great Lakes or out to the three mile territorial sea limit, the U.S. Census Bureau delineated some census tract boundaries along the shoreline or just offshore. The U.S. Census Bureau assigned a default census tract number of 0000 and BG of 0 to the offshore areas not included in regularly numbered census tract areas.In decennial census data tabulations, a block group may be split to present data for every unique combination of county subdivision, place, voting district, congressional district, American Indian area/Alaska Native area/ Hawaiian home land shown in the data tabulation products. This layer is part of the Bay Area Metropolitan Transportation Commission (MTC) GIS Maps and Data collection. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. California, Metropolitan Transportation Commission. (2002). Census Block Groups, 2000 - San Francisco Bay Area, California. MTC. Available at: http://purl.stanford.edu/nk081sx0125. This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.

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