All PHH Mortgage does is mortgages. PHH is a top-level mortgage servicer in this nation. Here's why. PHH closed $55.6 billion in mortgages in 2012 and has an average mortgage servicing portfolio of almost 1,100,000 loans. This great company operates all over America and is headquartered in Mount Laurel, New Jersey. The PHH banks and client list is an impressive one.