How I Met Your Mother (musim 4)

This season is currently the second highest rated season of "How I Met Your Mother" in terms of viewership, at an average of 9.42 million viewers. However, it is currently the highest rated in terms of the important Adults 18-49 demographic, which is what advertisers use to determine how much a 30-second advertising spot costs. Season 4 averaged 4.0/10 in terms of rating/share in the Adults 18-49 demographic.