The Census Bureau started release of Summary File 1 (SF1) data
from June 13, 2001 on a state-by-state basis.
SF1 contains the 100-percent data, which is the information
compiled from
the questions asked of all people and about every
housing unit. Most of the SF1 data is reported at the Census Block level.
Since the Transportation Analysis Zones defined in TIGER/Line 2000
are aggregations of Census Blocks, transportation planning agencies can
assemble SF1 data for their TAZs.
Attached is a note on SF1 data and a process to convert SF1
data to your TAZs.