Android smartphone users in the U.S. grew to an even greater share in comScore's latest ranking, hitting 43.7 percent, while iPhone users grew slightly to 27.3 percent.
The comScore data, based on a survey of 30,000 smartphone users for three months ending Aug. 31, also showed Research In Motion's share of the market drop in the prior three-month period ending May 31.
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The increase in the number of Android smartphones sold by several cellphone makers, including Samsung, LG, Motorola, and HTC, was substantial. Android phone sales grew by 5.6 percentage points, increasing its market share to 43.7 percent, up from 38.1 percent in the prior report. That's an increase of nearly 15 percent in three months.
Apple's iPhone had 84.5 million smartphone owners for a market share of 27.3 percent, ComScore said, up from 26.6 percent in May, an increase of 2 percent.
RIM, maker of BlackBerry smartphones, saw its share decline to 19.7 percent, down from 24.7 percent, a decrease of more than 20 percent.
Smartphones running Windows Phone 7 saw a slight decline over the previous report, slipping from 5.8 percent to 5.7 percent.
While RIM's downward trend is steep, the smartphone maker stands to continue increasing its smartphone sales because the overall smartphone market is growing dramatically, with 10 percent more smartphone users seen by comScore at the end of August as compared with the end of May.
Meanwhile, the top five smartphone manufacturers saw modest changes over the three months between the two reports. Samsung stayed on top with 25.3 percent of mobile phone subscribers, a 0.5 percentage point increase; LG slightly declined to 21.0 percent, down from 21.1 percent. Motorola also declined to 14 percent, down from 15.1 percent. Apple improved to 9.8 percent, up from 8.7 percent, while RIM declined to 7.1 percent from 8.1 percent.
Matt Hamblen covers mobile and wireless, smartphones and other handhelds, and wireless networking for Computerworld. Follow Matt on Twitter at @matthamblenor subscribe to Matt's RSS feed. His e-mail address is email@example.com. Read more about mobile oses in Computerworld's Mobile OSes Topic Center.