Located in the Eastern (GMT -05:00) time zone. Area code 717 serves the state of Pennsylvania. This area code was assigned on January 1st, 1947. On January 1st, 1947 it went into service. 717 is a General Purpose Code. 717 service area does overlap with 223 area codes. Dialing pattern for local calls within the same NPA (area code) is 10D. All calls within and between the 717 and 223 NPAs can be dialed as 10D or 1+10D. Calls to other NPAs must be dialed as 1+10D.