In upper Manhattan there are plenty of fields to choose from.  With Randall's island included there are more fields above 100th street then there are in the rest of Manhattan. Upper Manhattan has the islands with Randall's Island and Roosevelt Island adding a lot of quality.  On both the upper west side and the upper east side there are plent of good fields. However these fields all come above 100th street besides Marx Brothers Playground, and John McManus field. There are also no fields centrally in Manhattan which might be partially due to Central Park taking up a lot of space. Upper Manhattan has plenty of fields to choose from however the locations of the fields are all very similar and they are not well spread around.