“Number Crunch” Filming Locations
Reese and Finch struggle to keep up when the Machine gives them four numbers at the same time and Mark Snow approaches Carter about her hunt for Reese.
Person of Interest episode “Number Crunch” was filmed in New York in the United States of America.
138 East 78th Street as Claire Ryan's Apartment (exterior)
Reese goes to investigate the newest Number only to find her already murdered.
Metropolitan Hospital Center as St. George Hospital
Reese heads to the hospital and sees Wendy McNally visiting her mother.
Source: Permit List