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More than 157 million U.S. Internet users viewed online video during the month of June, the largest audience recorded for a single month, according to a new report from comScore.

The rise in video viewing is mainly due to important news stories during June, including Michael Jackson's death and the Iranian elections, which generated significant gains particularly at major media properties such as Viacom Digital (includes MTV), Microsoft sites (includes MSNBC) and Turner Network (includes CNN).

In June, Google sites continued to rank as the top U.S. video property with 7.6 billion videos viewed, with YouTube accounting for more than 99 percent of all videos viewed at the property.  Viacom Digital ranked second with 774 million videos (4% of the online video market) followed by Microsoft sites with 696 million (3.6%) and Blinkx with 623 million videos viewed (3.2%).

In June, Tremor Media ranked as the top video ad network with a potential reach of 74.4 million viewers, or 47.4 percent of the total viewing audience. Yume Video Network landed in the second spot with a potential reach of 66.5 million viewers (42.3%) followed by Broadband Enterprises Video Network with 64.1 million viewers (40.8%).

The majority (81.2%) of the total U.S. Internet audience viewed online video during the month with the average online viewer watching 453 minutes of video, or nearly 7.6 hours.

The average visitor to Hulu watched 10.1 videos, totaling more than an hour of videos per visitor. The length of the average online video was 3.7 minutes.