Liberty Mutual Group, more commonly known by the name of its primary line of business Liberty Mutual, is a diversified global insurer and the third largest property and casualty insurer in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 based on 2010 net written premium. It is the 82nd company on the Fortune 500 list for 2011. Based in Boston, Massachusetts, it employs over 45,000 people in more than 900 locations throughout the world.