The company reached 100 million members in March 2011, has doubled its number in less than a year.
New members are joining the professional social network at a rate of two per second.
LinkedIn currently has more than 160 million unique visitors each month and is the 23rd most visited website in the world.
The U.S. has the most LinkedIn members (74m) followed by India, (18m) the UK, (11m) Brazil (11m) and Canada (7m).
LinkedIn now reaches 200 countries and territories and is offered in 19 languages.
"It’s been amazing to see how our members have been able to transform their professional lives through LinkedIn," said LinkedIn’s SVP of product and user experience, Deep Nishar in a blog post. "You truly grasp the power of LinkedIn when you start to focus on these individual success stories.
"This milestone is more than just a metric — it’s a reminder of the global footprint and the scale of impact our network has each day," he added. "Members come first at LinkedIn and we remain focused on creating economic opportunity for every professional in the world. We look forward to bringing the power of the LinkedIn network to many more professionals in the coming years."
LinkedIn had strong Q3 2012 results with revenues increasing 81% compared to Q3 2011.
The company reported a net income of $2.3m compared to a net loss of $1.6m during Q3 2011.
LinkedIn’s projects its revenue for Q4 2012 to range between $270m to $275m with stock based compensation to range from $28m to $30m.