All libraries in the NYPL system may be used free of charge by all visitors .
As of 2016 , the New York Public Library consisted of four research centers and 88 neighborhood branch libraries in the three boroughs served .
All libraries in the New York Public Library system may be used free of charge by all visitors .
As of 2016 , the New York Public Library consisted of four research centers and 88 neighborhood branch libraries in the three boroughs served .