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Overnight ratings for Supernatural season 14 episode 19 "Jack in the Box". From Showbuzz Daily.
  Live Ratings (Overnights) Final Same Day Live +3 Day Live +7 Day  
18-49 0.4 0.3 0.6(+78%) .68(+96%)  
Total Viewers 1.301 1.284 1.95(+52%) 2.113(+65%)  
That makes us the #2 show on the CW tied with Legends of Tomorrow in the 18-48 demographic both of which came after The Flash.  When you factor in total viewers we are #2 behind The Flash and ahead of Legends of Tomorrow. We will update the ratings with Live +3 Day, Live +7 Day and CW Rankings as they become available.
For ratings for other episodes visit Supernatural Ratings, All Seasons by Episode.