Nielsen has released its latest report on the top smartphone makers and OS in the US. The latest report is much like the ones we have seen in the past. According to the Nielsen data for June, Android is the largest OS in the country with 39% share of the market. Apple and iOS are second with 28% of the market.

RIM saw its share decline for the month to 20% of the market. Nielsen also looked at the top smartphone makers to see who was at the top. With the share of iOS users in America so high, it’s clear that Apple is the top smartphone maker with only the iPhone running iOS. HTC, whose top devices run Android, sitting at 14% of the smartphone maker market share, Motorola is at 11%, and Samsung is at 8% of the market. All three of those makers are leaning heavily on Android.

HTC’s Windows 7 smartphones account for 6% of that OS market share. Symbian has only 2% of the smartphone market and is tied with WebOS. The total share of the OS market for Windows Mobile and WP7 is 9%.

[via Nielsen]