Sorry if this has already been mentioned, but where could I find congressional district data/populations in 2010, and also in 2016 (or most recent estimate)?
The Census Bureau American Fact Finder.
There was a special compilation of Census Data for the new congressional districts (113th session was after redistricting) (they won't be correct for Florida or Virginia, until they get updated they will be 115th)
The American Community Survey has estimates for congressional districts. Be sure to use 1-year 2015. Otherwise, you get blended data over 5 years - better for social characteristics since there is more data, but less so for a snapshot population. You could get 1-year data for previous years and try to project a trend line.
Somehow it's too big for my computer's memory. Is there another way; I'm mainly looking for actual population estimates for CDs in 2010 and 2015.