Google Inc.'s Android might be the most popular smartphone platform, but if you add other mobile devices like tablets to the mix, Apple Inc.'s iOS beats Android in the U.S. by a wide margin -- 59% to be exact.

That's according to new data being released Tuesday by measurement firm comScore, which surveyed 30,000 users of mobile devices for the three months ending in February to arrive at its estimates.

The research found that Apple's iOS platform -- on iPhones, iPads and iPod Touches – reached 37.9 million people, while Android reached 23.8 million, on phones and tablets.

"The finding is incredible because it shows that Android being the most popular smartphone is not the whole story," said Mark Donovan, the senior vice president of mobile at comScore. "Publishers, developers and advertisers are trying to understand how to reach audiences, and the study shows that users are using a range of devices."

ComScore also looked at the demographics of iPad owners, finding that 56.1% of them are men, and 49.4% make more than $100,000 a year. Ownership also skewed toward the younger set, with 27% of owners between the ages of 25 and 34.