According to data reported by private research firm ComScore, Google Plus had 19.93 million unique visitors between Jun 29 and Jul 19 period. Of the 19.93 million visitors, 5.31 million were from the US and 2.85 million from India.
Another 0.87 million users came from the UK, 0.71 million from Germany and 0.50 million from France.
ComScore officials said that the growth rate of Google+ shows that it has become the fastest growing social network in the world.
"I have never seen anything grow this quickly," vice president of industry analysis at ComScore Andrew Lipsman said.
Earlier, Paul Allen, the founder of Ancestry.com, reported that Google+ had crossed 18 million user mark, but its growth rate slowed down in last two days. He also added that Google+ was getting nearly 763,000 new users per day and if it continue this trend, then it will take nearly four or five months to reach 100 million users.