the awesomeness of census file 1 (SF1)
When downloading pipe-delimited sections of SF1 by census tract, you come accross a list of 286 smaller data sets. One of these is "P38. Group Quarters Population by Sex by Age by Group Quarters Type." There are 646 columns in this set alone. All in all, there are 8113 columns of census data for SF1 by census tract.