EarthWorks Geospatial Catalog

U.S. Census 2000 Data: Blocks

This polygon layer represents Census Blocks, the finest resolution of geographic boundary data developed by the U.S. Census Bureau for the 2000 Decennial Census. Census blocks are typically the size of city blocks: in fact, they often are city blocks, but they can be bounded not only by streets but also by other linear geographic features in the Census' Topologically Integrated Geographic Encoding and Referencing (TIGER) files, including streams and political boundaries. Each of these polygons is assigned a census block number in the TIGER file which is used to reference tabular data published by the Census Bureau. MassGIS has extracted and reprocessed data from the original TIGER files for use with its other data. Processing included import of the original data with the ArcInfo TIGERTOOL command, projection to the Massachusetts State Plane (NAD83 Meters) Coordinate system, and modification of the attribute table. MassGIS makes two versions available: - CENSUS2000BLOCKS_POLY (offshore, zero-population polygons were removed to present the appearance a coastline for display purposes); - CENSUS2000BLOCKS_POLY_ORIG (all polygons from original data are preserved)
census blocks, demographics, and population
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