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  1. Title: U.S. Census Block Centroid Populations, 2015

    Contributors:

    Summary: U.S. Census Block Centroid Populations represents the populations of the 2010 U.S. Census blocks as centroids for the United States. U.S. Census blocks nest within all other tabulated census geographic entities and are the basis for all tabulated data.

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  2. Title: United States Populated Place Areas, 2012

    Contributors:

    Summary: United States Populated Place Areas is a polygon theme representing populated place areas such as census designated places, consolidated cities, and incorporated places within United States identified by the U.S. Census Bureau. Attribute information includes the name, class, population classification, population density, number of housing units and size of the areas.

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  3. Title: United States Core Based Statistical Areas, 2012

    Contributors:

    Summary: United States Core Based Statistical Areas is a polygon theme representing geographic entities, defined by the United States Office of Management and Budget 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 economic and social 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 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.

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  4. Title: United States Census Block Centroid Populations, 2012

    Contributors:

    Summary: United States Census Block Centroid Populations is a point theme representing the populations of the 2010 U.S. Census blocks for United States. U.S. Census blocks are the smallest geographic entities within a county for which the Census Bureau tabulates population.. U.S. Census blocks nest within all other tabulated census geographic entities and are the basis for all tabulated data.

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  5. 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.

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  6. 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.

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  7. 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.

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  8. 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.

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  9. 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.

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  10. 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.

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  11. 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.

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  12. 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.

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  13. 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.

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  14. Title: New York City Elementary School Districts, 2008

    Contributors:

    Summary: New York City Elementary School Districts, 2008 is a polygon theme representing elementary school districts in New York City in 2008.

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  15. Title: New York City ZIP Code Tabulation Areas (ZCTA5), 2008

    Contributors:

    Summary: New York City ZIP Code Tabulation Areas (ZCTA5) is a polygon theme representing zip code areas in New York City.

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  16. Title: U.S. Census Urbanized Areas, 2013

    Contributors:

    Summary: U.S. Census Urbanized Areas represents the 2010 Census urban areas in the United States. An urban area comprises a densely settled core of census tracts and/or census blocks that meet minimum population density requirements, along with adjacent territory containing non-residential urban land uses as well as territory with low population density included to link outlying densely settled territory with the densely settled core. To qualify as an urban area, the territory identified according to criteria must encompass at least 2,500 people, at least 1,500 of which reside outside institutional group quarters. The U.S. Census Bureau identifies two types of urban areas—Urbanized Areas (UA) of 50,000 or more people and Urban Clusters (UC) of at least 2,500 and less than 50,000 people. The U.S. Census Bureau delineates urban areas that represent densely developed territory, encompassing residential, commercial, and other non-residential urban land uses. In general, this territory consists of areas of high population density and urban land use resulting in a representation of the "urban footprint."

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  17. 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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  18. Title: Census Counties, 2000 - San Francisco Bay Area, California

    Contributors:

    Summary: This polygon shapefile displays the 9 counties for the San Francisco Bay Area of California, as of January 1, 2000. The primary legal divisions of most states are termed ''counties.'' Each county and statistically equivalent entity is assigned a three-digit Federal Information Processing Standards code that is unique within the state. These codes are assigned in alphabetical order of county or county equivalent within each state.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 Counties, 2000 - San Francisco Bay Area, California. MTC. Available at: http://purl.stanford.edu/hv237bh9962. 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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  19. Title: Census Counties, 2000 - San Francisco Bay Area, California (Clipped)

    Contributors:

    Summary: This polygon shapefile displays the boundaries for the 9 counties of the San Francisco Bay Area in California as of January 1, 2000. These data have been clipped to the shoreline for cartographic representation. The primary legal divisions of most states are termed ''counties.'' Each county and statistically equivalent entity is assigned a three-digit Federal Information Processing Standards (FIPS) code that is unique within the state. These codes are assigned in alphabetical order of county or county equivalent within each state. 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 Counties, 2000 - San Francisco Bay Area, California (Clipped). MTC. Available at: http://purl.stanford.edu/xv509rh6426. 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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  20. Title: Census Blocks, 2000 - San Francisco Bay Area, California

    Contributors:

    Summary: The polygons in this data layer represent U.S. Census Blocks for the San Francisco Bay Area in California. These data have been clipped to the shoreline for cartographic representation. Census blocks are statistical areas bounded on all sides by visible features such as streets, roads, streams, and railroad tracks, and by invisible boundaries such as city, town, township, and county limits, and short imaginary extensions of streets and roads. Generally census blocks are small in area; for example, a block in a city bounded by streets. However, census blocks in remote areas may be large and irregular and contain hundreds of square miles. All territory in the United States, Puerto Rico, and the Island Areas have block numbers. Blocks are composed of one or more GT-polygons; that is, several GT-polygons can share the same block number. Census 2000 Block Numbers. Census 2000 tabulation blocks are numbered uniquely within each state/county/census tract with a four-digit census block number. The U.S. Census Bureau created the tabulation block numbers immediately before beginning its Census 2000 data tabulation process, thereby eliminating block suffixes. The first digit of the tabulation block number identifies the block group. For the 1990 census, the U.S. Census Bureau assigned a unique 1990 block number with a suffix of "Z" to identify crews-of-vessels population. For Census 2000, crews-of-vessels population is assigned to the land block identified by the U.S. Census Bureau as associated with the home port of the vessel. Water Blocks. The U.S. Census Bureau introduced a different method for identifying the water areas of census blocks for Census 2000. For the 1990 census, water was not uniquely identified within a census block; instead, all water area internal to a block group was given a single block number ending in "99" (for example, in block group 1, all water was identified as block 199). A suffix was added to each 1990 water block number where the block existed in more than one tabulation entity within its block group. For Census 2000, water area located completely within the boundary of a single land block has the same block number as that land block. Water area that touches more than one land block is assigned a unique block number not associated with any adjacent land block. The U.S. Census Bureau assigned water block numbers beginning with the block group number followed by "999 " and preceding in descending order. For example, in block group 3, the block numbers assigned to water areas that border multiple land blocks are 3999, 3998, 3997, and so forth. Because some land blocks include water (ponds and small lakes), no conclusions about whether or not a block is all land or all water can be made by looking at the Census 2000 block numbers. Data users must use the WATER field on Record Type S to determine if the GT-polygon is land or water. The WATER field has two values, 0 for land or 1 for water. 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 Blocks, 2000 - San Francisco Bay Area, California. MTC. Available at: http://purl.stanford.edu/ts501wk9853. 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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