comScore, Inc. (NASDAQ:SCOR) released its U.S. Online Video Rankings for June 2012 today.

According to the press release, about 180 million U.S. internet users viewed 33 billion online content videos in June.

June was also a record for video advertising, as almost 11 billion video ads were viewed.

Rankings of the top U.S. online video properties:

As expected, Google sites topped the list, with about 155 million unique viewers, and 18.3 billion views. Following behind were Yahoo! Inc. (NASDAQ:YHOO), Facebook Inc (NASDAQ:FB), VEVo, Viacom digital, Microsoft Corporation (NASDAQ:MSFT) sites, AOL, Amazon sites, Turner Digital and Vimeo, in that order. The last-named entered the top 10 for the first time ever.

Rankings of the top 10 video ad properties by video ads viewed:

As mentioned, this was a record-breaking month for video advertising. Significantly, each of the top 5 video ad properties delivered more than 1 billion video ads.

Topping the list on the basis of the number of video ads was Google Sites with 1.41 billion ads, followed by BrightRoll video network, Hulu, AdapTV, TubeMoghul, Tremor, SpotXchange, Specific Media, ESPN, and Auditude, in that order.

On the basis of total ad minutes, i.e. time spent watching ads, BrightRoll was the topper with 805 million minutes.

On the basis of frequency, i.e. number of ads per viewer, Hulu topped with nearly 52 ads per viewer.

Online video advertising reached a total of 53% of the U.S. population in June.

Ranking of YouTube Partner Channels by Unique Video Viewers

The June 2012 YouTube partner data revealed that video music channels VEVO (45.1 million viewers), and Warner Music (26.1 million viewers) maintained the top two positions. Gaming channel Machinima ranked third with 23.6 million viewers, followed by Maker Studios with 21.2 million, and FullScreen with 16.2 million.