Top U.S. Online Ad Networks by Reach, September 2010

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Below, the top ten online display advertising networks in the U.S. by reach, according to data from comScore.

The measurement firm estimates Yahoo's network continues to reach more U.S. users than any other, with 85.9 percent audience penetration. AOL Advertising and Google's Ad Network follow it, with 85.7 and 82.7 percent, respectively, followed by ValueClick and Turn Media.

Networks operated by 24/7 Real Media, AdBrite, Collective Network, Specific Media, and Microsoft round out the top ten.