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Google’s (NASDAQ:GOOG) Android operating system rose to 39 percent U.S. market share through June, up from 38 percent in May, according to Nielsen.

Apple’s iOS-based iPhone is still in second place, but rose to 28 percent from 27 percent in May and 26 percent in April.

While Android leads by dint of massive exposure across multiple OEMs selling handsets in the United States and all over the world, Apple remains the top smartphone maker in the United States with that 28 percent share.

HTC is No. 2 with 20 percent in the United States, including 14 percent of Android phones and 6 percent of Windows Mobile/Windows Phone 7 gadgets.

Motorola is No. 3 with 11 percent of all Android phones. Samsung follows at a total of 10 percent U.S. share, with 8 percent of Android phone sales and 2 percent of Windows Mobile/WP7 sales.

In other Nielsen smartphone market share updates, Research In Motion’s (NASDAQ:RIMM) BlackBerry continued to lose share for June, accounting for 20 percent share. That’s down from 21 percent in May and 23 percent in April.

Smartphones based on Microsoft’s Windows Mobile and Windows Phone 7 accounted for 9 percent of the U.S. market as the company continues its gradual transition of replacing Windows Mobile in favor of WP7.

To read the original eWeek article, click here: Android Hits 39% Smartphone Share, iOS at 28%: Nielsen