View a list of ZIP codes in Petersburg, PA; Petersburg, PA ZIP Code Boundaries; Download Petersburg, PA ZIP Code Database
The professional class, also called the upper middle class, consists mostly of highly educated white collar salaried professionals, whose work is largely self-directed. In 2005, these household incomes commonly exceed $100,000 per year.
There is no standard definition of the upper middle class. Many researchers have defined the group as households or families with incomes in the top 20%, excluding the top 1% or 2%.