In Pennsylvania, the points assigned to your driving record for going 19 miles per hour over the speed limit, thus going 59 mph in a 40 mph zone, is 4 points. If the violation occurred in an active work zone there would also be a 15 day suspension of your license.
It is important not to get too many tickets or traffic citations that have points attached to them since in PA when a person's driving record accumulates 6 points for the first time the driver will receive a written notice to take a special written point examination. The exam would include knowledge of: safe driving, departmental sanctions and related safety issues. If the exam is not successfully passed within 30 days, the person's license will be suspended until it is passed. If the exam is passed within the 30 day time period, 2 points will be removed from the driving record.
You can find more information regarding the PA points system from the Pennsylvania Driver and Vehicle's Services department.