Pandora Media Inc (NYSE:P), an internet radio service provider said the number of its registered users in the United States reached the 200 million milestone.

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The first user of Pandora Media Inc (NYSE:P)’s internet radio registered in the summer of 2005. After six years, in July 2011, its registered users increased to 100 million.

The company’s internet radio service is becoming more popular as the company added 100 million registered users in less than two years.

In a statement, Tim Westergren, founder of Pandora Media Inc (NYSE:P) said, “We started this company to help people discover and enjoy music they love, and to help artists reach and grow their audiences. Only in our wildest dreams did we imagine what it would become. It is now clear that radio is changing, and that’s great news for music fans and for the tens of thousands of working artists who now have a home on the air.”

According to Pandora Media Inc (NYSE:P), it streams 200 million songs before 10AM every day and its listeners personalized their stations. The company received more than 25 billion ‘thumbs up’ ratings from its registered users.

According to the internet-radio service provider, more than 140 million listeners tuned in to Pandora using their mobile devices, wherein one in three smartphone users tune in every month. In addition to this, Pandora Media Inc (NYSE:P) said it played more than a million songs from 100,000 unique artists last month.

According to Pandora Media Inc (NYSE:P) it streamed 1.49 billion hours of music last month and has more than 400 curated genre stations. Its FM stations play less than 40 genre formats.

Pandora also announced the integration of its audience data with Strata and Mediaocean’s Donovan and Mediabank stewardship system. According to the company, the integration with the three most popular media buying platforms enables radio ad buyers to compare its audience data side-by-side with other broadcast radio stations across the United States.

Prior to the integration of Pandora’s audience data, radio buyers were researching its audience ratings manually. Companies have spent more than $14 billion in radio spot advertising annually.

In a previous statement, John Trimble, chief revenue officer of Pandora said, “It’s great to see STRATA and Mediaocean embrace innovation and respond to marketplace demand. With consumers shifting from broadcast to internet radio, it’s important to have the industry adopt technology to help advertisers make smarter planning and buying decisions. The integrations will help advertisers understand the power of internet radio and make the smartest buying decision at both the national and local levels.”

Pandora Media Inc (NYSE:P) has 69.5 million active users, up from 59.9 million in December last year.