As far as I know
Xianlin: Nanjing Normal University (undergraduate), Nanjing University of Finance and Economics, Nanjing University of Posts and Telecommunications, etc.
Pukou: Nanjing University, Southeast University, Nanjing Agricultural University (Institute of Technology), Nanjing University of Technology and so on.
Jiangning: New campus of Southeast University (undergraduate and some graduate students), Nanjing University of Aeronautics and Astronautics (undergraduate students), etc.
There are also some vocational and technical schools in the above campuses.
I wonder how many students there are in each university town.