A recent project of The New York Times allows to ‘browse local data from the Census Bureau‘s American Community Survey, based on samples from 2005 to 2009’. It’s a great visual and interactive application designed by By MATTHEW BLOCH, SHAN CARTER and ALAN McLEAN.
Several topics and maps are available
and provide insights down to cities and blocks
‘Because these figures are based on samples, they are subject to a margin of error, particularly in places with a low population, and are best regarded as estimates.’