Census Data Geometry

Geometry outlines (area/polygon shapefiles), Tract level data, Block Groups, or Blocks

• The data will be in files by state (they used to be by county).  You can merge these shape files to get a larger region, or you can filter the state to get a county, and then export that to a separate file).  See the maps below to get a sense of the level of aggregation each level provides.
• Download options

Anne Arundel County, Maryland, 2000 Census and Earlier
6537 Blocks	309 Block Groups	95 Tracts
TABBLOCK00	BG00	TRACT00
Limited data, but based on 100% response ("short form") for the 2000 Census.  Now only legislative redistricting data is available for blocks.	For 2000 and earlier census, much richer data than for blocks, but based on statistical sampling of only some households ("long form") For 2010 Census, replaced with American Community Survey Data

ESRI SF1 data, single block group Join BKGPIDFP00 to STFID	ESRI SF1 data, single tract Join CTIFFP00 to STFID

Sample output.

Last revised 9/13/2012