|Download this layer: "Clipped" version | Original version with ocean polygons|
Windows self-extracting .exe containing:
- statewide ESRI Shapefile (census2000blocks_poly.* | census2000blocks_poly_orig.*)
The polygon attributes (census2000blocks_poly.dbf and census2000blocks_poly_orig.dbf) for the Census 2000 Blocks shapefiles distributed by MassGIS contain the following items:
ITEM NAME TYPE / WIDTH DESCRIPTION AREA N / 20 Area of polygon(s) in square meters. PERIMETER N / 20 Perimeter of polygon(s) in meters. STATE C / 2 State ID Code (Massachusetts = 25) COUNTY C / 3 County code (FIPS-ID without “25”) TRACT C / 6 Census 2000 Tract Code BLOCKGROUP C / 1 Census 2000 Blockgroup Code BLOCK C / 4 Census 2000 Block Code BLK_ID C / 20 Unique Block ID value BG_ID C / 20 Unique Blockgroup ID value CT_ID C / 20 Unique Census Tract ID value LOGRECNO C / 7 Common field to join/link to related attribute tables REPDISTNUM N / 3 State Representative District Code SENDISTNUM N / 2 State Senate District Code CD108 N / 2 108th U.S. Congressional District Code TOWN_ID N / 3 Town ID Code POP_2000 N / 6 Census 2000 Population Value (from SF1) DRY_PCT N / 6 Percentage of non-water area for the block DRY_ACRES N / 6 Non-water area, in Acres DRY_SQMI N / 6 Non-water area, in Square Miles DRY_SQKM N / 6 Non-water area, in Square Kilometers ** - For the most accurate display of population density by Block, normalize POP_2000 by any of the last three items.
Related Demographics Tables
The following table, available in dBase format (.dbf), which provides detailed demographics information, may be joined to the Blocks shapefiles on the LOGRECNO item. See the Field Descriptions page for details.
Lists how many members of each gender fall within incremental age categories. Download (includes field description Excel file)
More tables storing demographics data that may be joined to the Blocks shapefiles will be forthcoming. In addition, the REPDISTNUM, SENDISTNUM, and CD108 items may be used to join these tables to the State Senate, State Representative, and 108th U.S. Congressional district layers, respectively.
MassGIS updated the two verisons of the Blocks layer in April 2003: a small number of polygons had miscodings in some of the MassGIS-added fields (TOWN_ID, REPDISTNUM, and SENDISTNUM). Additionally, the "DRY" fields were added to these layers.
Other 2000 U.S. Census Metadata
- WHAT MASSGIS PROVIDES
- CONSIDERATIONS WHEN USING TIGER DATA
- OTHER RESOURCES
Last Updated 5/29/2013