Out of a total audience of 256.1 million unique U.S. Internet users, fully 95% (242.4 million) visited a property owned by Google Inc. (NASDAQ: GOOGL) in May. That is an astounding number.

The unique U.S. audience for online video totaled 192.9 million in May, and Google-owned sites attracted 162.1 million, or 84%. Another astonishing number. Based on a U.S. population of 318.9 million, nearly 51% of all Americans viewed a video at a Google site in May.

The total unique visitor count includes both desktop and mobile platforms and both home and work locations. The online video count comprises home and work locations only for desktop computers and does not include advertiser videos. The numbers were reported Friday by comScore, based on the company’s Media Matrix and Video Matrix analytics programs.

Trailing Google in the overall unique visitor count are Facebook Inc. (NASDAQ: FB) with 214.4 million visitors and Yahoo! Inc. (NASDAQ: YHOO) with 209.5 million. These are the only three properties to surpass 200 million unique visitors in May.

Among the other top online video sites are second-place Facebook with 85.6 million unique visitors and Yahoo with 59.1 million.

Rounding out the top 10 multi-platform properties in May are Amazon.com Inc. (NASDAQ: AMZN) with 182.6 million unique visitors; Microsoft Corp. (NASDAQ: MSFT) with 176.7 million; AOL Inc. (NYSE: AOL) with 167.8 million; Mode Media with 148 million; Apple Inc. (NASDAQ: AAPL) with 141.1 million; Comcast Corp. (NASDAQ: CMCSA) with 135.1 million; and CBS Interactive with 131.6 million.

Only one traditional retailer made the list of the top 50, and that was Wal-Mart Stores Inc. (NYSE: WMT) with 86 million unique visitors.

ALSO READ: Amazon Online Audience Doubles Wal-Mart’s

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