The number of millionaires in Pennsylvania is on the rise. The state Department of Revenue says between 2013 and 2017, the number of millionaires in the Commonwealth jumped 30 percent, from 13,412 to 17,484. Also, the Revenue Department says Columbia County saw the biggest surge in million-dollar earners of any county in the state. Between 2013 and 2017 the number of million-dollar earners in Columbia County jumped by nearly 61%...again the biggest increase of any county in the state. As of 2017, the state Department of Revenue says Columbia County had 28 residents with taxable incomes of a million-dollars or more a year.