The numbers highlight the steadily growing presence of Microsoft's search engine in the U.S. When taken into account the 12.7 percent market share held by Yahoo, Bing powered over 30 percent of all organic search results conducted in the country in March. During the course of the month, 18.9 billion search queries were conducted, with Google serving 12.1 billion of them, followed by Bing with 3.8 billion searches and Yahoo Sites (which are powered by Bing) with 2.4 billion.

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It remains to be seen how Bing's cumulative market share will be affected by Yahoo's revised search agreement with Microsoft, which states that only 51 percent of Yahoo's desktop searches will be powered by Bing, with the Palo Alto giant free to decide how it wants to power mobile search queries.

Source: comScore