Nearly 75 percent of U.S. Internet users watched an average of three hours of online video in July, with Google sites pulling in the most unique video viewers and the most videos watched, comScore announced Thursday.

Of the more than nine billion videos Americans watched online, 2.5 billion, or 27 percent, of those were viewed on Google sites, and 2.4 billion of those were on YouTube.com. Yahoo sites ranked a distant second, with 390 million, or 4.3 percent. Fox Interactive Media had 298 million, 3.3 percent, and Viacom Digital had 281 million, 3.1 percent, according to comScore data.

Almost 134 million Americans viewed online videos in July. Google claimed 67.8 million unique viewers, while Fox Interactive Media captured 35.8 million and Yahoo sites had 35.3 million.

comScore data also revealed that the average online video lasted 2.7 minutes, and the average online video viewer watched 68 videos, or more than two each day.