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    2010 Census Block Groups A Census Block Group is a geographical unit used by the United States Census Bureau which is between the Census Tract and the Census Block. It is the smallest geographical unit for which the bureau publishes sample data, i.e. data which is only collected from a fraction of all households. Census 07/08/15 07:41 AM
    census_blck_2007_hholdunits_pdx Census 08/20/07 05:08 PM
    census_blocks_2010_pdx Census 12/26/18 03:51 PM
    census_tracts_2010_pdx Census 07/07/15 03:22 PM