From
TVbytheNumbers I'm also now including the 18-49 demo rating in parentheses. This demo is the most coveted by advertisers and is more important than overall total viewers.
Arrow - 4.14 million (1.3)
Vampire Diaries - 3.82 million (1.6)
Beauty and the Beast - 3.15 million (1.3)
Supernatural - 2.51 million (1.0)
Hart of Dixie - 1.19 million (0.5)
90210 - 940,000 (0.4)
Gossip Girl - 780,000 (0.4)
Dr. Horrible's Sing Along Blog - 510,000 (0.2)
For easy reference/comparison:
We Need to Talk About Kevin - 1.85 million