Published: January 17, 2017
Approved by the Pennsylvania Public Utility Commission on October 27, 2016 the new area code 223 will serve the south portion of the state currently using area code 717, covering cities such as Lancaster, Gettysburg, Harrisburg. There will be a permissive 7/10 digit dialing period and then all calls in the area will be dialed using 10 digits.
See official announcement from NANPA and other info (PDF document).
Visit area code 223 page for a list of cities served, map and other info.