I'm not a data person, but the PL-94-171 Files for 2010 and 2000 will have rudimentary counts at the block level. The block data used to come out in STF (Summary Tape File) 3. But that was 1980. I'm dating myself! I found this using Google: http://gis.stackexchange.com/questions/9380/where-to-get-2010-census-block-data Good luck! Don
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